The hypothalamic hormone, growth hormone-releasing hormone (GHRH) and its pituitary receptor are principal regulators of pituitary growth hormone (GH) synthesis and release. In the present study, we cloned and sequenced a complete bovine pituitary GHRH receptor cDNA in order to study its expression in cattle. The lengths of the exons in the bovine GHRH receptor gene were determined by compariso...

Data from the same 138 New York dairy farms for the years 1994 through 1997 were used to estimate whether Bovine Somatotropin (bST) generated profits for adopters. Data from these same farms from 1993 were used to sort farms into groups by production per cow, profit per cow, and farm size, in order to test bST response by these delineators. Statistically, farms that used bST on average experien...

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...

Data from a national survey representative of U.S. dairy operations were used to assess adoption and the production and financial impacts of recombinant bovine somatotropin (rbST). Adoption rates of rbST varied significantly across the nation, but were higher among larger diary operations in all regions. However, the scale bias of rbST adoption was substantially diminished when the influence of...

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...