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.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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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.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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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.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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