Effects of mesenteric vein n-butyrate infusion on liver metabolism by beef steers
Article Abstract:
The effects of n-butyrate infusion of the portal vein on nutrient and hormone metabolism in the beef cattle liver were examined. Much of the n-butyrate absorbed from the gut is metabolized before reaching the portal vein, and the small amount that reaches the portal vein is extracted by the liver. Hereford x Angus steers with catheterized hepatic, portal and mesenteric veins and caudal aorta were used in the study. The results showed that n-butyrate infusion caused a change in the net removal of glucose precursors by the liver. The results have applications in diet formulation, specifically in identifying the most efficient precursors for glucose synthesis in the liver.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Response to reimplanting beef steers with estradiol benzoate and progesterone:performance, implant absorption pattern, and thyroxine status
Article Abstract:
The effect of estrogenic ear implant Synovex-S on feedlot performance,tissue deposition, and thyroid status was studied using a randomized block design with 48 Hereford steers per trial. The steers were treated as control, implanted on day 0 and reimplanted at day 60 on trial, implanted at day 30 on trial, and implanted on day 0 only. Resuts showed implanting improved feed conversion, greater protein and less fat deposition occurred within 28 days after initial implanting, and that no differences were noted on the thyroid status between steers implanted once with those reimplanted at day 60.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Recombinant bovine somatotropin improves growth performance in finishing beef steers
Article Abstract:
Recombinant bovine somatotropin was administered at constant concentrations and different volumes to determine efficacy of variable doses on growth performance of beef steers. An optimal dose of 13 micrograms per kilogram body weight per day elicited an increased rate of body weight gain, improved carcass composition and efficiency of feed utilization on steers given high concentrate and high-protein diet during the finishing phase.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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