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PubMed1999

Reproductive performance of dairy heifers after estrus synchronization and fixed-time artificial insemination.

The reproductive performance of heifers after estrus synchronization and fixed-time AI was compared with nonsynchronized heifers in 25 spring-calving herds. Within herds, heifers were divided into a synchronized (n = 1123) or a control (n = 1125) group. Heifers in the synchronized group were treated with a combination of progesterone, estradiol benzoate, and PGF2 alpha and were inseminated between 50 and 54 h after progesterone treatment. Returns to first service were resynchronized with progesterone treatment between 16 and 21 d after the fixed-time AI. The conception rate of synchronized heifers to the fixed-time AI (53.2%) and to AI after resynchronization (53.1%) was lower than that of control heifers (63.7%). However, pregnancy rate in the first 24 d was higher for the synchronized group (72.4%) than for the control group (67.8%). More control heifers (5.7%) than synchronized heifers (4.0%) failed to conceive. The interval from start of breeding to calving was earlier for synchronized (296.2 d) than for control (299.5 d) heifers. Jersey heifers had lower reproductive performance than did Friesian heifers. Synchronized heifers gave birth to more female calves (53.8%) than did control heifers (45.7%). It is concluded that the above program can be used successfully to synchronize dairy heifers for fixed-time AI.

Animals↗
PubMed1980

Artificial insemination of individually caged broiler breeders. II. The relationships of juvenile male traits with subsequent reproductive traits.

The relationship of the reproductive performance and semen characteristics of commerical broiler parent males with their body weight at 6, 8, 10, and 12 weeks of age, keel length, shank length, breast angle at 8 weeks of age, and packed erythrocyte volume at 6 and 8 weeks of age were examined. Phenotype correlations of juvenile traits with subsequent reproductive traits were generally of low magnitude, except for the significant positive correlations of 6- and 8-week body weight with fertility. Positive correlations existed between fertility and semen quality traits which were significant in some cases. Six-week body weight and spermatozoal motility appeared to be the most useful traits in predicting a male's fertility.

Animals↗
PubMed1983

Evaluation of artificial insemination techniques on fertility in laying hens.

The effects of depth of intravaginal insemination of two subsequent semen ejaculates from Rhode Island Red (RIR) and Light Sussex (LS) cockerels on fertility and embryonic mortality of eggs from RIR hens were investigated. Intravaginal insemination to a depth of 3.5 cm resulted in significantly higher fertility than shallow insemination to .5 cm (74.0 vs. 62.3%). Although not statistically significant, fertilizing capacity of first ejaculate of semen collected from either RIR or LS males was greater than the second ejaculate (71.4 vs. 64.9%).

Animals↗
PubMed1991

Reproductive performance of artificially inseminated hens receiving saline drinking water.

Laying hens were selected at random and placed in individual cages in a commercial type layer shed. One hundred hens received town water and one hundred received town water supplemented with 2 g NaCl/L. Half the hens on each water treatment were inseminated every 7 days with mixed semen collected from six cockerels of a commercial table egg strain maintained on town water. The remaining hens were inseminated with semen from six cockerels receiving town water supplemented with 2 g NaCl/L. Eggs were collected and stored at 12 C over a 7-day period before eggs with defective shells were identified and removed. All remaining eggs were incubated and candled at 7 and 18 days of incubation to detect infertile eggs and embryonic deaths. Data from six consecutive hatches were analyzed. The incidence of eggs with defective shells doubled in hens receiving the saline drinking water. These hens had a significantly (twofold) higher incidence of embryonic deaths and a significantly lower (13%) hatchability of fertile eggs. For every 100 eggs laid the numbers of settable eggs and chicks hatched were significantly reduced in hens receiving the saline drinking water. The saline water reduced the numbers hatched by 20% for every 100 eggs laid. The water treatment given to the cockerels had little effect on reproductive performance.

Animals↗