Search PubMed⌕ Search

Biomedical subjects

R D Boyd

Publications and source records attributed to R D Boyd.

At least 91 records · Page 5Linked to original sources
PubMed1987

Early vascular changes in rabbit subchondral bone after repetitive impulsive loading.

The sequence of vascular and bony changes that precedes experimental osteoarthrosis was observed in rabbits. The subchondral bone underlying the weight-bearing portion of the medial tibial condyle and the talocalcaneal joint were examined after two, three, and six weeks of 50-ms and 500-ms repetitive loading at 1 Hz for 40 minutes each day. Vascular alterations were evident in the subchondral bone of the talocalcaneal joint after three weeks of a 50-ms load regime. A 10% increase in bone mass and a significant increase in the number of small diameter vessels were observed after six weeks. No changes were observed in the tibial subchondral bone, consistent with the measured attenuation of load distal to this joint. No changes were observed in either tibial or calcaneal subchondral bone in the 500-ms load group. Impulsive loading promotes early vascular changes in subchondral bone, which are developed in response to both the magnitude and the rate of loading.

Animals↗
PubMed1986

Dietary iron overload persists in rural sub-Saharan Africa.

In a survey of 505 rural Zimbabweans, iron overload was found almost exclusively among men who consumed traditional beer brewed in steel drums. Among drinkers aged over 45 years, 23 of 111 men (21%) had high serum ferritin and a transferrin saturation of over 70%, a combination that indicates a risk of liver disease and other pathological effects from excess body iron. Iron overload, which is reported to be decreasing among urban Africans, may remain a public health issue in rural areas where more than 80% of the people of sub-Saharan Africa live.

Adult↗
PubMed1986

Changes in free fatty acids and triiodothyronine in response to feeding in pigs.

Ten pigs were surgically implanted with jugular venous catheters. Blood samples were acquired before, during and after meals that occurred ad lib or after 5-hr or 17-hr fasts. 3,3',5-Triiodothyronine (T3) concentration increased (p less than 0.05) from 0.49 +/- 0.04 to 0.91 +/- 0.13 ng/ml (mean +/- SE) following feeding only when the pigs had been fasted for 17 hr prior to the meal. In contrast, free fatty acid levels decreased (p less than 0.05) with feeding under ad lib, 5-hr fasted and 17-hr fasted conditions. Free fatty acid concentration decreased from 222 +/- 66 mEq/l to 91 +/- 20 mEq/l (mean +/- SE) in pigs fed ad lib. Free fatty acids may function as hunger signals or their decrease may serve as a satiety signal in free-feeding animals. T3 may buffer against a large caloric intake associated with large meals, by increasing dietary thermogenesis.

Animals↗
PubMed1986

Radioiodide transfer across sheep placenta.

Unidirectional transplacental clearances of radioiodide were calculated from the net radioiodide fluxes after injection into fetal and/or maternal circulations of 33 catheterized conscious sheep. Maternofetal potential difference (PD) was also recorded. Clearance reached a steady state 20 min after bolus injection. Fetomaternal clearance was related to PD. Bidirectional clearance ratios measured in five experiments showed a significant divergence from the value for passive flux predicted from the measured PD, and in four experiments these ratios were also significantly different from unity, this result being incompatible with passive flux even if the transplacental PD is assumed to be zero. Injection of thiocyanate or iodide reduced radioiodide clearance. Fetomaternal clearance of radioiodide was halved by an increase in fetal plasma iodide concentration of approximately 0.1 mM. There appears to be an inhibitable iodide-transporting site capable of active transport in either direction.

Animals↗
PubMed1986

Electrical activity and sodium transfer across in vitro pig placenta.

Electrical activity generated by pieces of pig placenta, taken from anesthetized animals and mounted in Ussing chambers, has been investigated. Ten minutes after the start of voltage clamping, potential difference (PD; fetal side positive, open circuit), short circuit current (SCC), and resistance were 5.9 +/- 0.4 (SE) mV, 8.6 +/- 0.5 microA X cm-2, and 720 +/- 45 omega X cm2, respectively (n = 50). Ouabain (10(-4) M) added to the fetal side caused a maximum decline in PD and SCC from the time of addition of -3.7 +/- 0.98 mV and -3.9 +/- 1.4 microA X cm-2 (n = 6); epinephrine (10(-5) M) added to the fetal side caused increases of +1.0 +/- 0.2 mV and +4.0 +/- 1.4 microA X cm-2, respectively (n = 14). Drug concentrations for 50% maximum response for the effect of a series of adrenergic agonists on SCC were (in M) isoproterenol 1.2 +/- 0.05 X 10(-8), norepinephrine 6.1 +/- 0.3 X 10(-8), epinephrine 2.4 +/- 0.1 X 10(-7), and phenylephrine 4.7 +/- 0.2 X 10(-5), suggesting the involvement of fetally oriented beta-adrenergic receptors. Fetal epinephrine (10(-5) M) also stimulated net Na+ flux (Jnet) toward the fetal side to an extent equal to its effect on SCC. In control experiments Jnet was small but was inhibited by fetal side ouabain (10(-4) M) to produce a maternally directed Jnet, significantly different to the SCC. Replacement of Na+ by choline reduced SCC markedly but did not abolish it. In the absence of Na+, epinephrine had no effect on SCC. These results suggest that active Na+ transfer is not completely responsible for the control electrical activity of pig placenta. Epinephrine, however, modulates SCC entirely by stimulating net Na+ transfer toward the fetal side.

Adrenergic Agonists↗
PubMed1986

Comparison of joint degeneration models. Surgical instability and repetitive impulsive loading.

We used surgical instability and repetitive impulsive loading in rabbits to initiate degenerative changes in knee joints. Synovial membrane and cartilage samples were examined by light and electron microscopy. Early synovial inflammation at three days postoperatively preceded cartilage destruction in the instability model. Synovial inflammation was only apparent after eight weeks in the loading model and increased subsequently to cartilage destruction. Cartilage breakdown was focal and limited to the weight-bearing area. Comparison of the histological data of the two arthrosis models suggests that different inductive mechanisms may be involved in cartilage degeneration, but in both models the inflammatory changes appeared to be secondary to mechanical factors.

Animals↗
PubMed1985

Effect of exogenous glucagon and free fatty acids on gluconeogenesis in fasting neonatal pigs.

Thirty-two pigs (1 d old) were used to determine if exogenous glucagon and(or) free fatty acids (FFA oleic acid) would enhance gluconeogenesis and glucose homeostasis during fasting. Pigs were acquired at birth, fitted with an indwelling arterial cannula (via umbilicus) and fasted 24 h to deplete liver glycogen. A jugular cannula was inserted nonsurgically 8 to 10 h before initiation of a primed-continuous infusion consisting of control (excipient), glucagon (Glu), oleic acid (FFA), or both glucagon and oleic acid (Glu-FFA). Plasma Glu averaged 395 pg/ml preinfusion and was similar across treatments. The concentration increased fivefold (P less than .05) by 80 min for Glu and Glu-FFA pigs and remained constant thereafter (160 min: 2,379, 2,258 pg/ml; 240 min: 2,355, 2,274 pg/ml, respectively). Glucagon infusion did not alter plasma glucose after 240 min of infusion (control, 50 vs Glu, 51 mg/dl); however, Glu-FFA effected an increase (60 mg/dl, P less than .10). In contrast, pigs infused with FFA alone had a lower glucose concentration (40 mg/dl, P less than .10). Rate of glucose synthesis was determined using liver slices, acquired immediately postinfusion, with alanine and lactate as substrate (7.5 mM). The rate of synthesis was not altered by Glu or Glu-FFA infusion (2.91, 2.43 mumol glucose X g-1 X h-1 vs 2.91 for control). In contrast, exogenous FFA reduced synthesis to 1.85 mumol glucose X g-1 X h-1 (P less than .05) with lactate as substrate. It appears that Glu is not the primary factor limiting gluconeogenesis in fasting newborn pigs.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1985

Effect of 1,3-butanediol and short chain acids in sow gestation diets on maternal plasma metabolites and fetal energy storage.

Gestating sows were fed diets in which 15% of the metabolizable energy was in the form of glucose monohydrate (control), 1,3-butanediol (BD) or an equimolar mixture of acetate and lactate (AL) in order to study the effects of ketogenic, glucogenic and lipogenic substrates on fetal energy storage. Diets were initiated on d 90 of gestation. Blood plasma was obtained from sows 2 and 8 h after feeding on d 102 of gestation. Sows receiving BD had a higher (P less than .001) concentration of beta-hydroxybutyrate (.54 vs .12, .14 mM) and a lower (P less than .05) concentration of glucose (72 vs 82, 86 mg/dl) after 8 h than sows in control or AL groups, respectively. Sows in the AL group had a higher (P less than .10) acetate concentration at 2 h, but no difference was observed by 8 h. Lactate concentration was lower (P less than .10) in AL sows when compared with those in the control group (69 vs 101 mg/dl). Two pigs/litter were killed at birth and two/litter were fasted for 36 h with blood samples obtained at 12-h intervals. Newborn pigs from AL and BS sows had more total liver glycogen than pigs derived from control sows (4.18, 4.07 vs 3.09 g, respectively); however, this difference was significant only for pigs from AL sows (P less than .10). Pigs in BD and AL groups had a higher (17 to 25%), though not significantly different, glucose concentration than controls after 24 and 36 h of fasting.(ABSTRACT TRUNCATED AT 250 WORDS)

3-Hydroxybutyric Acid↗
PubMed1984

Effects of mechanical loading on the tissues of the rabbit knee.

We studied changes in subchondral bone and articular cartilage in an animal model of osteoarthrosis. In this model we applied repetitive impulsive loads to rabbits' knees. Their legs were held in short leg splints so the rabbits were unable to dampen the peak applied load with ankle flexion. After sacrifice, at 1 day to 6 weeks, we studied proximal tibial load-bearing cartilage histologically, biochemically, and with radioactive sulfate uptake. We also studied the subchondral bone under that cartilage histologically, histomorphometrically, with bone scan (99mTc pyrophosphate), and by tetracycline labeling. An increase in 99mTc labeling of the subchondral bone was the first reliable change observed. This was followed by an increase in tetracycline labeling, bone formation, and a decrease in porosity, which has been associated with relative stiffening of bone. Horizontal splitting and deep fibrillation of the overlying articular cartilage followed the early bone changes. All of these changes preceded changes in content and characterization of cartilage proteoglycans or increased chondrocyte activity as manifested by incorporation of radioactive sulfate. In this model the early bone changes preceded changes in the articular cartilage. The deep splitting of articular cartilage occurred prior to metabolic alteration of that tissue.

Animals↗
PubMed1983

Relaxin enhances synchronization of parturition induced with prostaglandin F2 alpha in swine.

To investigate the effects of relaxin on induction of parturition in swine, 59 sows and gilts were randomly allotted within parity to 4 treatment groups. Control animals were injected with saline while the other 3 groups received prostaglandin F2 alpha (PGF, 10 mg i.m.) at 0800 h on Day 112 of gestation to induce luteolysis and parturition. Relaxin (600 U i.m.) was administered either on Day 111 or on both Days 110 and 111 to 2 groups of sows receiving PGF. All farrowings were attended and the time of delivery of each piglet was recorded. PGF injection on Day 112 of gestation induced parturition in 43 of 44 treated animals. The interval (mean +/- SD) from Day 112 to parturition in control animals was 70 +/- 30 h and this was decreased to 30 +/- 9 h with PGF alone. When relaxin was administered prior to PGF on Day 111 or on both Days 110 and 111, parturition occurred after 26 +/- 4 or 27 +/- 3 h, respectively. Thus, relaxin treatment had little effect on reducing the interval to parturition, but improved the synchrony of onset of farrowing as indicated by a decrease (P less than 0.01) in variation. Relaxin pretreatment prevented any instances of delayed parturition (after 35 h) which occurred in 1/3 of the cases in response to PGF alone. This variation in response appeared unrelated to parity of sow. The mechanism by which relaxin enhanced the synchronous onset of parturition after PGF treatment in swine is unknown, but the most likely suggestions are through sensitization of the uterus to the withdrawal of progesterone and the well-known effects of relaxin on cervical dilatation.

Animals↗
PubMed1983

Volumes of distribution of sodium and albumin in the sheep placenta.

The volumes of distribution of 22Na and 24Na, 51Cr-EDTA and albumin labelled with 131I and 125I were measured in cotyledons and skeletal muscle taken from pregnant sheep and the fetuses near term. Radiolabelled substances were injected through chronically implanted catheters 0.5-3.2 hr before removal of tissues in 'short-term' experiments and 24-26 hr before in 'long-term' experiments. Volumes of distribution were expressed as percentages of tissue weights. Cotyledonary water content was 81.5 +/- 0.6% (S.E. of mean) of wet weight (n = 10 sheep). Sodium content was 76.0 +/- 4.0 m-mole kg-1 wet weight (n = 4) and potassium content was 58.8 +/- 2.4 m-mole kg-1 wet weight (n = 4). In short-term studies cotyledonary spaces following injection into the fetal circulation were: Na, 20.5 +/- 0.9% (n = 10 sheep); Cr-EDTA, 19.5 +/- 1.2% (n = 3); and albumin, 2.8 +/- 0.3% (n = 11). The equivalent maternal cotyledonary spaces were: Na, 23.5 +/- 1.6%, or 22.1 +/- 1.6% when 'corrected' for fetal radioactivity (n = 8); and albumin, 4.7 +/- 0.8% (n = 8). Maternal and fetal cotyledonary sodium spaces were additive. Larger cotyledons had larger fetal sodium spaces. In long-term studies, the value for maternal albumin spaces was considerably higher 12.3 +/- 3.2% (n = 3), whereas that for fetal albumin spaces was only 3.9 +/- 0.4% (n = 4). The higher fetal sodium space of 24.9 +/- 1.0% (n = 4) in the long-term experiments was attributable to rising sodium counts in the maternal circulation. In the short-term experiments maternal skeletal muscle spaces were Na, 13.5 +/- 1.3% (n = 7) and albumin, 1.7 +/- 0.3% (n = 7), with higher values of 22.0% (n = 2) and 3.8 +/- 0.2% (n = 3) respectively in long-term experiments. In the short-term experiments fetal skeletal muscle spaces were Na, 32.8 +/- 3.2% (n = 7) and albumin, 2.5 +/- 0.3% (n = 10), with higher values of 39.7 +/- 7.4% (n = 4) and 16.2 +/- 0.6% (n = 4) respectively in long-term experiments.

Animals↗
PubMed1983

Avoidable factors in child death.

There were 131 deaths among children aged between birth and 14 years during a period of 18 months in one inner London area health authority. One hundred children died in hospital, 23 at home, and 8 elsewhere. Thirty three died of congenital, 46 of perinatal, and 34 of other medical causes. There were 18 violent deaths--16 among children over 1 year of age. Medical and social information, collected from analysis of records and interview with those involved, was considered by a review panel and the following conclusions were drawn: there was scope for prevention of congenital disease or malformation in only one of 33 cases; with routine pathological investigation the cause of death in postperinatal infancy was usually unclear--more detailed pathological investigation should be routinely available for the investigation of deaths in the first year of life; there were possible management failures in four of 8 non-malignant medical deaths in older children; malignant disease was promptly diagnosed; fatal accidents were almost entirely restricted to the children of families under marked psychosocial stress; and there was some evidence of faulty communication between health agencies and of the inappropriate routing of emergency admissions.

Accidents↗
PubMed1983

Plasma alkaline phosphatase as a criterion for determining biological availability of phosphorus for swine.

One hundred thirty-nine pigs, with an average initial weight of 15.9 kg, were used in three trials to evaluate plasma alkaline phosphatase (AP) as a criterion for estimating available P in feedstuffs for swine. The first two trials were designed to determine the effect of adding graded levels of P (as KH2PO4) to a basal diet on the AP response pattern and degree of linear fit with time. Plasma AP increased (P less than .05) with time and, when regressed on the concentration of total P (.26 to .50%), provided the best linear fit by d 14 (r = -.996). This high degree of fit was maintained through d 21 (r = -.983). The poor correlation observed at 7 d (r = -.828) indicated that the AP pattern was not fully established, whereas departure from the close association by 28 d (r = -.913) may be related to a decline in the magnitude of P deficiency with increasing weight. In a third trial, available P was determined in high moisture corn (HMC, 24.6% moisture) using both AP and bone breaking strength (BKS) as response criteria. A standard curve was established by supplementing the basal diet (.26% P, .65% Ca) with graded levels of KH2PO4. High moisture corn was substituted for dextrose on an equal dry matter basis. Blood samples were acquired on d 14 and 21 for AP analysis and pigs were killed on d 28 for determination of metatarsal BKS. Phosphorus from HMC was determined (slope-ratio technique) to be 41.3% available using BKS as the criterion (KH2PO4, r = .961; HMC, r = .994) and 43.8% when AP at 14 d was used (KH2PO4, r = -.988; HMC, r = -.999). The data indicate that AP is a sensitive index potentially useful in P availability studies.

Alkaline Phosphatase↗
PubMed1982

Effect of tallow and choline chloride addition to the diet of sows milk composition, milk yield and preweaning pig performance.

Four trials were conducted with a total of 188 crossbred sows to determine the effect of feeding diets supplemented with tallow (0 or 8%) and choline chloride (220 or 770 mg/kg diet) prior to parturition and during lactation on preweaning pig performance. On d 100 of gestation, sows were allotted to four factorially arranged dietary treatments: 0% tallow-220 mg/kg choline chloride, 0% tallow-770 mg/kg choline chloride, 8% tallow-220 mg/kg choline chloride, 8% tallow-770 mg/kg choline chloride. Diets without tallow were fed at the rate of 1.82 kg/d with an additional .18 kg/d of cornstarch, whereas sows receiving diets supplemented with tallow were fed 1.82 kg/d. Daily metabolizable energy intake was constant for all diets (approximately 6,240 kcal). Following parturition, the diets were fed ad libitum for a 21-d lactation period. Pig survival to 21 d, in relation to the number of pigs born alive/litter, did not differ significantly between litters from sows receiving tallow (94.0%) and litters from sows receiving the control diet (92.5%). Although not significantly different, there was a trend toward slightly heavier pigs (6.35 vs 6.11 kg) and litters (53.97 vs 51.94 kg) after the 21-d lactation period in the groups nursing sows receiving tallow-supplemented diets. Litter performance was not improved by the addition of choline to sows' diets. A second study was conducted to measure the effect of energy source on milk yield and composition. Twelve crossbred sows was allotted to two dietary treatments (0 and 8% tallow), each supplemented with 770 mg choline chloride/kg of diet. The composition of colostrum and milk was determined on d 0, 9 and 18, and milk yield was measured on d 12 and 19. Throughout the lactation period, sows fed the tallow supplemented diet produced higher concentrations of total milk solids (22.15%, P less than .10) and fat (14.9%, P less than .01) than the control group (21.37 and 12.0%, respectively). Milk protein content, averaged over the lactation period, was lower (P less than .10) for sows receiving tallow (8.60 vs 9.22%); however, the depression appeared to be related to the colostrum samples, because values for the two treatment groups were similar on d 9 and 18. The mean milk yield was 9.44 kg/d for sows receiving tallow and 8.72 kg/d for those fed the control diet. Therefore, not only did sows in the tallow group produce a greater concentration of milk solids and fat, but the total quantity of the milk constituents available to the offspring was increased.

Animals↗
PubMed1982

Oxidation rates of major fatty acids in fasting neonatal pigs.

Thirty-two pigs were used to compare the oxidation rates of uniformly labeled (U-14C) palmitic (16:0), stearic (18:0), oleic (18:1) and linoleic (18:2) acids in fasting neonatal pigs. The pigs were allowed to nurse the sow for 24 to 48 h following birth. Subsequently, they were removed, an indwelling catheter was surgically placed in the external iliac vein and the pigs were fasted for 12 h to attain a postabsorptive state. The 14C fatty acids were administered as a single infusion (10 microCi) via the catheter, and recovery of the label as expired 14CO2 was determined at 45-min intervals for a 6-h period. Blood samples were taken following the infusion (15, 60, 120, 240, 360 min) to monitor activity maintained within the free fatty acid (FFA) fraction of the plasma pool. The oxidation rate of each fatty acid was corrected for the difference in dose dilution using a uniform factor based on plasma concentration of 18:1. The cumulative 6-h 14CO2 recovery rates (percentage of dose) were 19.1, 6.6, 30.1 and 13.1% for 16:0, 18:0, 18:1 and 18:2, respectively. Oleic acid was oxidized at a more (P less than .05) rapid rate than the other fatty acids. Palmitic acid and 18:2 were oxidized more rapidly than 18:0, although the difference between 18:0 and 18:2 was not significant. Plasma FFA pools differed with respect to the proportion of infused activity remaining at various times after administration. At 60 and 120 min postinfusion, the greatest (P less than .05) proportion of activity was maintained in the 18:1 pool (11.9 and 6.6%, respectively, vs 7.7 and 4.3% for 16:0, 6.9 and 3.9% for 18:2 and 3.6 and 2.2% for 18:0). Palmitic acid and 18:2 had a greater (P less than .05) level of activity in the plasma FFA pool at 60 min than did 18:0. This same pattern was observed through 2 h, but by 240 min postinfusion, the proportion of activity remaining in each of the plasma pools was similar. Rate of oxidation appeared to corrrespond with plasma concentration and proportion of activity remaining in the plasma FFA pool.

Animals↗
PubMed1982

Toxicologic studies with swine fed corn grown on municipal sewage sludge-amended soil.

Over a 3-yr period 336 MT/ha of dried sewage sludge, from a municipal waste treatment plant, was applied in liquid form to land subsequently used to grow corn. The sludge contained 115 mg Cd, 4,200 mg Zn and 538 mg Ni/kg dry matter and comprised the solids remaining after treatment of the waste waters of approximately 260 industries as well as domestic users. Corn grain harvested from the plot amended with sewage sludge (SA corn) or corn grown on a plot without sludge addition (control corn) was fed to a total of 56 pigs to determine the effect on growth performance and parameters indicative of toxicity. Each treatment consisted of seven pens of four pigs each with an average initial weight of 17.6 kg. The growth trial was terminated when pigs weighed approximately 90 kg. No differences were observed between treatment groups for average daily gain, feed: gain ratio or daily feed intake. Higher (P less than .01) concentrations of Cd, Ni and Zn were found in SA corn compared with the control corn. This resulted in higher (P less than .01) concentrations of Cd in kidney and liver and Ni in kidney of pigs fed SA corn as compared with pigs fed control corn. No significant differences were observed in Cd or Ni concentrations in muscle or in hepatic microsomal mixed-function oxidase (MFO) activity and liver:body weight ratios, which is indicative of the absence or low levels of organic toxicants in SA corn. In addition, no significant treatment effects were observed when corn, feces and urine samples were evaluated for the presence of mutagenic substances. Histopathologic analysis of various tissues for lesions demonstrated that pigs fed SA corn were not adversely affected.

Animals↗
PubMed1981

Effect of maternal dietary energy source on glucose homeostasis, liver glycogen and carcass lipid in the neonatal pig.

Two experiments were conducted to determine the effects of supplementary dietary energy (carbohydrate versus fat) fed to sows during late gestation on energy storage and glucose homeostasis in neonatal pigs. In the first experiment, 28 crossbred sows received one of two dietary treatments that were initiated on day 100 of gestation. The control group was fed daily 1.82 kg of a corn-soybean meal-based diet plus an additional .18 kg of cornstarch. Their counterparts were fed 1.82 kg of a corn-soybean meal diet containing 8% bleachable fancy tallow. The effect of maternal dietary energy source during late gestation on glucose homeostasis was evaluated by fasting pigs from birth (t0), whereas the gestation-lactation effect was evaluated by fasting pigs after they had nursed the sow for 24 hr (t24). Pigs on the tallow treatment responded differently to the t0 fast, as determined by the patterns of plasma glucose (treatment x time, P less than .05) and free fatty acids (treatment x time, P less than .10). The tallow group maintained a slightly higher glucose concentration during the initial 24 hr, after which no difference was observed. Control pigs reached a peak free fatty acid (FFA) concentration by 12 hr, whereas the tallow group reached a maximum by 24 hr, which corresponded with declining glucose concentration. Pigs on the t24 tallow treatment maintained a slightly higher plasma glucose concentration during the initial 24 hr of fasting (12 hr - 68.3 vs 63.2 mg/100 ml; 24 hr - 67.1 vs 56.3 mg/100 ml); however, no significant treatment effect or treatment x time interaction was observed. Pigs on the tallow treatment maintained a higher, although not significantly different, plasma FFA concentration during the fast (144 mueq/liter) than pigs in the control group (126 mueq/liter). In the second experiment, progeny of 12 sows were sacrificed immediately after birth. The respective carcass lipid (percentage) and liver glycogen (milligrams/gram) concentrations for pigs from sows fed the control and tallow diets were 1.48, 229.1 vs 1.50, 234.9. The liver glycogen to body weight ratio (milligrams:gram) was 7.1 and 7.8 for the control and tallow groups, respectively.

Animal Feed↗