Effects of growth curve parameters on cow efficiency
Article Abstract:
A study conducted to identify the relationship between growth curve parameters and cow efficiency in Retinta beef cows indicated that productivity of cows with large adult weight was less than that of normal weight cows. Weight-age data was interpreted in terms of von Bertalanffy, Brody and Richard functions and factors, such as number of calves weaned in the first five weaning seasons and average weight at the time of birth, were used to assess productivity in cows. A mathematical model to describe the growth parameters was developed and the effects of pasture fertilization on rate of maturing were also assessed.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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The effect of body condition, live weight, breed, age, calf performance, and calving date on reproductive performance of spring-calving beef cows
Article Abstract:
Factors affecting the reproductive performance of 321 spring-calving cows were assessed. Higher body condition at the start of the mating period resulted in shorter calving intervals. Blue-Grey cows had higher pregnancy rate and shorter calving intervals as compared to older Hereford x Friesian cows. Body condition at calving and at the end of the mating period, calf birth weight and calf performance had no significant effects on the cows' reproductive performance. Further research is needed to know other factors which influence the reproductive performance of cattle.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Accessory sperm: their importance to fertility and embryo quality, and attempts to alter their numbers in artificially inseminated cattle
Article Abstract:
The importance of accessory sperm number to fertilization and embryo quality was analyzed after retrieving embryos six days postinsemination. Attempts to change accessory sperm number were futile but blockage of semen resulted in decreased numbers of viable embryos. Therefore, the number of accessory sperms is directly related to embryo formation and is a good index for evaluation of male and female factors in animal reproduction.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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- Abstracts: Effects of selection cutting and landscape-scale harvesting on the reproductive success of two Neotropical migrant bird species
- Abstracts: Effects of nutrient deficiencies and excesses on reproductive efficiency of livestock. Research applications of ultrasonic imaging in reproductive biology
- Abstracts: A review of ectoparasites and their effect on cattle production. Phenotypic and genetic relationships between residual energy intake and growth, feed intake, and carcass traits of young bulls
- Abstracts: Effects of mesenteric vein n-butyrate infusion on liver metabolism by beef steers. Recombinant bovine somatotropin improves growth performance in finishing beef steers
- Abstracts: Effect of porcine stress syndrome on the solubility and degradation of myofibrillar/cytoskeletal proteins. Effect of a hot environment on performance, carcass characteristics, and blood hormones and metabolites of pigs treated with porcine somatotrophin