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Biomedical subjects

K A Yamani

Publications and source records attributed to K A Yamani.

9 recordsLinked to original sources
PubMed1995

Daily energy allotments and performance of broiler breeders. 1. Males.

The effects of daily energy intake on reproductive performance of Arbor Acres males and on growth of their offspring was studied. In Experiment 1, 21 males were placed in individual pens with 12 females. Three rations, differing in energy, were fed from 24 to 57 wk of age with seven males receiving either 300, 340, or 380 kcal ME/d. In Experiment 2, 32 individually caged males were given daily allotments of 280, 320, 360, or 360 kcal ME/d from 26 to 32 wk of age and 300, 340, 380, or 380 kcal ME/d from 32 to 38 wk. Rations of the two groups of males fed the highest energy level differed in formulation, one being the same wheat short-based basal ration as fed to the two lower energy groups, only with additional fat, and the other being a corn-soybean-based ration. Body weight and testes weight were increased with increased energy allotment in both experiments but carcass composition was unaltered. There were no significant effects of energy intake on fertility or hatchability in either experiment. Even though mean differences were not significant, fertility in two pens dropped to near zero at 38 wk in Experiment 1. Semen characteristics and plasma testosterone concentrations were unaffected by energy intake in Experiment 2. There was a significant linear increase in 6-wk BW of broilers associated with the increase in sire energy intake in each of three batches of broilers grown in Experiment 1 and in one of two batches of broilers grown in Experiment 2.

Animals↗
PubMed1995

Daily energy allotments and performance of broiler breeders. 2. Females.

Arbor Acres broiler breeder hens, 21 to 61 wk of age, were given the daily ME level recommended by the primary breeder for their age and level of production (100% AA) or were given 94 or 88% of that amount. The reduction in daily energy allotment had no effect on age at 50% or age at peak production, but there was a highly significant linear decrease in the eggs per hen from 165 +/- 2.8 in hens given 100% AA to 149 +/- 3.2 and 141 +/- 3.8 in hens given 94 and 88% AA. The percentage of nonlaying hens between 44 and 60 wk of age was substantially increased as daily energy allotment was reduced. The percentage settable eggs was significantly lower in the 100% AA group, but no differences in fertility or hatchability were seen. Chicks per hen fell from 123 +/- 2.4 to 116 +/- 2.4 to 102 +/- 2.6 as energy allotment was progressively reduced. Dietary energy allotment had no effect on egg weight, shell weight, shell characteristics, or proportion of albumen and yolk. Chick weight was unaffected but chicks' liver weight increased with increasing dam energy intake. Percentage lipid in hens' carcasses increased with increasing energy intake and percentage protein and percentage ash decreased.

Animals↗
PubMed1994

Response of broiler breeder hens to forced molting by hormonal and dietary manipulations.

Experiments were conducted to compare dietary and hormonal techniques for molting broiler breeder hens. In the first experiment, production dropped to 5% 3 wk after hens were restricted to an intake of one half of their calculated energy requirement (FR). Egg production levels of hens given a single i.m. injection of the Lupron Depot formulation of leuprolide acetate (LA) in a dose intended to provide 10 micrograms/kg BW per d for 30 d dropped to 9.5% whereas production dropped to 33% in hens receiving 5 micrograms and was unchanged by 2.5 micrograms. Postmolting fertility and hatchability of eggs from the FR and the 10-micrograms LA groups were not different. In the second experiment, postinjection egg production, oviduct weight, and uterus weight were depressed, in a dose-related manner, when hens received 0, 10, or 22 micrograms LA/kg per d. In a third experiment, egg production dropped to zero within 2 wk when hens were deprived of feed (FD) or deprived of feed and light (FD+LR), whereas it reached zero in 4 wk in hens fed only 30 g of wheat shorts per d (FR). Lupron Depot at a dose intended to deliver 30 micrograms/kg BW per d, reduced egg production to 9.5% by the 3rd wk. Twenty-eight weeks postmolting, egg production ranged from 84 to 98 eggs per hen in the molted groups and 56 eggs per hen in the unmolted controls. Fertility ranged from 82.1% in the FD+LR groups to 69.8% in the unmolted controls, whereas chick production averaged 36, 50, 59, 60, and 68 chicks per hen in the unmolted controls and in hens molted by LA, FR, FD, or FD+LR, respectively.

Animals↗
PubMed1976

The effect of light stimulus on Pekin ducks in the subtropics. Effect on the reproduction.

Experiments were carried out to study the effect of an extended light period (natural, gradual, and abrupt) on the semen characteristics, fertility, and hatchability of Pekin ducks. The results obtained can be summarised as follows: 1. Night feeding has no reliable effect on the semen production and characteristics in drakes. Thus, any improvement in the semen characteristics of different treated groups compared to the control may be traced back to light stimulus only. 2. Light stimulus showed a favourable effect on the semen volume and sperm motility, concentration, viability and normality during the two laying seasons. 3. Subjection of ducks to artificial light had a favourable effect on their fertility and hatchability.

Animals↗
PubMed1975

Preliminary study on using fermented skim milk in poultry rations.

80 (4 X 20) four-month-old cockerels were fed the following rations for six weeks: Group 1 = corn and green berseem, group 2 = corn, green berseem, and skim milk, groups 3 and 4 = corn, green berseem, and fermented skim milk. Feeding was ad libitum in groups 1 to 3, and 80% of the group 3 standard in group 4. The live weight increased in all groups during the experimental period. In group 4 it was higher at the end of the experiment than that of groups 1 to 3. But the difference was statistically not significant. The amount of starch units required per unit of live weight increase during the experimental period was 9.76 (group 1) 11.00 (group 2), 10.72 (group 3), and 9.66 (group 4). The visceral fat weights were higher in groups 2 and 3 (not significant). 40 (2 x 20) four-week-old ducklings were fed a commercial ration (group 5) or 65% of this ration supplemented with 35 ml of fermented skim milk (group 6). There were no significant differences in the live weight gains. The amount of starch units required per unit of live weight increase was 2.89 (group 5) and 3.61 (group 6).

Animal Feed↗