نتایج جستجو برای: oral recombinant bovine somatotropin
تعداد نتایج: 431340 فیلتر نتایج به سال:
Earlier immunological investigations of growth hormone (somatotropin) isolated from bovine and human pituitaries showed that these two protein hormone preparations form speciesspecific antibodies, as evidenced by the results of precipitin ring tests with rabbit antiserum and of anaphylactic shock experiments in guinea pigs (1, 2). It was further demonstrated that the rabbit antiserum exerts in ...
Our goal was to assess the economic impact of some environmentally friendly technologies on production costs and cost-effectiveness a dairy cattle confinement system, estimating environmental their representativeness in both effective total operating costs, as well cost. We assessed cost center milk identified components that most affect final break-even point (kg year-1) well. The data were co...
An ex ante adoption model of bovine somatotropin (BST) is estimated with survey data of California milk producers. Theoretical justification is developed for incorporation of socioeconomic explanatory variables in a technology-adoption model. The advantages of a multinomial over a binomial ex ante model also are presented. The multinomial logit model is used to predict BST adoption, to test hyp...
We examined the effect of intramuscular injections of recombinant bovine interferon-7 on basal body temperature and plasma concentrations of progesterone in cows. Six mature, nonlactating Holstein cows were synchronized for estrus and assigned randomly to a replicated 3 x 3 Latin square design to receive 0, 1, or 5 mg of recombinant bovine interferon-7 intramuscularly on d 9, 12, or 15 of the e...
The aim of this study was to determine the effect of prepartum somatotropin injection in late-pregnant Holstein heifers on metabolism, milk production and resumption of postpartum ovulation. For this study, 31 late-pregnant Holstein heifers were used. The heifers were assigned randomly into two treatments: (1) 500 mg sc injections of somatotropin (somatotropin treatment, n = 15) at -35 and -21 ...
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