Phenotypic and genetic relationships between residual energy intake and growth, feed intake, and carcass traits of young bulls

Article Abstract:

The phenotypic and genetic relationships in residual energy intake (REI) was obtained by heritability estimates and phenotypic standard deviations in young bulls fed at will. The two expressions of REI were closely related and influenced by daily feed intake. Carcass composition is independent of production trait and residual intake and is not needed in determining REI. Increased daily feed intake selection increases residual intake resulting to less efficient animals.

Animal feeding and feeds, Animal genetics

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A review of ectoparasites and their effect on cattle production

Article Abstract:

A study was conducted to assess the physiological and nutritional responses in cattle infested with horn flies. Results showed a significant difference in nitrogen retention, blood cortisol concentrations, vital signs, water consumption and urine production. Appetite was also affected and reduced amount of feed ingested by parasitized animals was digested less efficiently. Infestation can increase metabolic rate and reduce amount of metabolizable energy for production.

Methods, Ectoparasitic infestations, Flies, Diptera, Plant breeding, Forage plants, Forage plant breeding

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Digestion, feed intake, and live weight gain by cattle consuming bermudagrass hay supplemented with whey

Article Abstract:

Supplementing bermudagrass hay with a moderate amount of ground corn results in increased average daily weight gain in cattle. Further increases in weight are seen when whey is partially substituted for corn. This may reflect alterations in ruminal microbial activity, but specific mechanisms are still unkown. Using whey alone as a supplement resulted in slightly decreased hay intake, but still increased weight gain.

Health aspects, Whey, Hay

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