Heritabilities of and genetic, environmental, and phenotypic correlations among serum calcium, phosphorus, and magnesium and weight at weaning
Article Abstract:
Amounts of serum calcium (WCa), phosphorus (WP) and magnesium (WMg) at weaning can be used to make a genetic assessment of cattle breeds. To be able to use these traits in multiple-trait mixed-model procedures, it is necessary to obtain first an estimate of their genetic, environmental and phenotypic variances and covariances. Records were obtained from 380 Angus x Brahman calves of various A and B genotypic fractions and were used to estimate heritabilities of WCa, WP, WMg and WW. The results showed that WCa, WP and WMg can indicate cattle genotypes that require low amounts of the macrominerals for growth.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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The effect of natural toxins on reproduction in livestock
Article Abstract:
The effect of poisonous plants on the reproductive efficiency of livestock is analyzed. Phytotoxins affect reproduction in various ways. Some plants, like locoweed, inhibit sprematogenesis and oogenesis. Others have deleterious effects on embryonic and fetal development or cause abortion or embryonic death. Reproductive cycles may be directly affected, with lengthened postpartum intervals observed. Neonatal survival can be adversely affected by toxins ingested during gestation or passed on during lactation. These plants are estimated to cause losses reaching $340 million annually.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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