Progesterone production by cultured luteal cells in the presence of bovine low- and high-density lipoproteins purified by heparin affinity chromatography

Article Abstract:

Progesterone production in bovine luteal cells was identically stimulated by bovine high-density lipoprotein and low-density lipoprotein, regardless of the presence or absence of apolipoprotein B. Progesterone production was also elicited by particles containing cholesterol without apolipoproteins, indicating that some cholesterol uptake is receptor-independent. Cholesterol esters did not stimulate steroidogenesis, suggesting that either apolipoproteins are necessary for uptake or they do not participate in progesterone production.

Physiological aspects, Cholesterol, Lipoproteins, Progesterone, Bovidae

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Management systems for Holstein steers that utilize alfalfa silage and improve carcass value

Article Abstract:

A study conducted on Holstein steers fed on alfalfa silage with or without the trenbolone acetate and estradiol (TBA+E) implant did not reveal any significant influence of either diet or the implant on carcass traits. The effect of three different alfalfa feeding systems, with or without TBA+E implant, on the growth performance and carcass traits of animals was assessed. Cattle implanted with TBA+E showed higher efficiency of feed utilization than unimplanted cattle.

Usage, Influence, Beef cattle, Cattle, Alfalfa, Feed utilization efficiency, Estradiol, Cattle carcasses, Alfalfa as feed, Alfalfa feeds

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