Reproductive response of yearling beef heifers to a melengestrol acetate-prostaglandin F2alpha estrus synchronization system
Article Abstract:
Results of a study conducted to assess the influence of melengestrol acetate (MGA) and prostaglandin F2alpha (PGF2alpha) on yearling beef heifers indicated that administration of MGA-PGF system induced puberty, synchronized estrus and improved fertility rates. To assess the fertility rates and estrus responses of beef heifers, subsequent to the administration of MGA and PGF, the animals were divided into two groups. Heifers in the experimental group received pre-determined doses of MGA and PGF2alpha while those in the control group did not receive the two drugs.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Evaluation of reproductive traits in Bos taurus and Bos indicus crossbred heifers: relationship of age at puberty to length of the postpartum interval to estrus
Article Abstract:
The relationship between the two reproductive traits of age at puberty (AAP) and length of the postpartum interval (PPI) to estrus was determined in Bos taurus and Bos indicus crossbred heifers calving at two years of age. The results showed a negative correlation between AAP and PPI in Angus x Hereford crosses, but no such relationship was found in Brahman x Hereford crosses. Heifers that reached puberty at younger ages were those that were heavier at weaning, but these same heifers had longer PPI to estrus compared to those that were lighter at weaning.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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The use of ultrasound in monitoring reproductive physiology of beef cattle
Article Abstract:
Monitoring cattle reproductive function using ultrasound is an effective technique in evaluating the reproductive physiology of cattle, particularly ovarian activity and embryo viability. Although ultrasound techniques can be used to determine the sex of the fetus and fetal mortality, use of ultrasonics in this regard is unlikely in cattle herd management. The greatest impact of ultrosonics is in its utilization in improving the diagnosis of pregnancy. Ultrasound techniques are potentially effective tools in improving reproductive management in cattle.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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