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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Forage availability x heifer phenotype interactions for Brahman-Hereford F1 yearling heifers grazing humid pasture and semiarid rangeland

Article Abstract:

A four-year experimental study on heifers indicated that phenotype shows greater adaptation to forage availability for cattle grazing on humid pastures than for cattle grazing on semi arid regions. Heifers were allotted to one of the four feeding systems, each year. At the end of the year heifer traits such as, weight and height at hooks, were measured to assess the interaction between phenotypic traits and forage availability. Forage availability affected the general characteristics of animals grazing on humid pastures of Overton while the opposite was observed for animals grazing on semiarid pastures of Uvalde.

Author: Holloway, J.W., Warrington, B.G., Rouquette, F.M., Jr., Long, C.R., Owens, M.K., Baker, J.F.
Publisher: American Society of Animal Science
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
Influence, Phenotype, Phenotypes, Rangelands, Pasture ecology, Heifers

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Quantitative influence of lysine and energy intake on yield of milk components in the primiparous sow

Article Abstract:

The interactive effects of lysine and metabolizable energy (ME) intake on yield of milk components in primiparous sows are evaluated. Sow body weight and backfat losses were influenced by ME intake and not by lysine intake. Furthermore, the amount of lysine required to maximize milk yield increased as ME intake increased. The effects of these two variables on yield of milk components are not directly related with changes in precursor concentrations. Thus, energy intake must be considered when computing for lysine requirements of sows.

Author: Dial, G.D., Crooker, B.A., Tokach, M.D., Pettigrew, J.E., Sower, A.F.
Publisher: American Society of Animal Science
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
Animal nutrition, Lysine, Sows, Milk production, Lysine in animal nutrition

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Interrelationships of heifer milk production and other biological traits with production efficiency to weaning

Article Abstract:

The correlation between milk production and feed conversion efficiency of dams and calves was determined in 411 first-calf crossbred and purebred Hereford heifers. Results showed that elevated milk production is associated with an increase in production efficiency up to weaning. However, the individual variation in milk production and its effect on productivity in subsequent gestations has to be taken into account in evaluating cattle performance.

Author: Freking, B.A., Marshall, D.M.
Publisher: American Society of Animal Science
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
Cattle, Feed utilization efficiency, Animal reproduction

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Subjects list: Research, Food and nutrition, Physiological aspects, Lactation
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