The Empirical Impact of Bovine Somatotropin on a Group of New York Dairy Farms
利用纽约奶牛场面板数据，估计牛生长激素的采纳函数，并衡量其对每头奶牛产奶量和盈利的影响。发现该激素显著提高产奶量，但对利润的影响在统计上不显著。
Abstract Data from a panel of New York Dairy farms were used to estimate bST adoption functions, and to measure the impact of bST on milk output and profitability per cow. Adoption results are consistent with previous ex ante bST adoption studies. Farm size, productivity, and education of the principal operator are the most important explanatory variables influencing adoption. The use of bST was found to significantly increase milk output per cow net of other explanatory variables, correcting for self‐selection with respect to bST use. The impact on profits was, however, not statistically different from zero at any conventional statistical significance level.