Live Weight and Milk-Energy Yield in Holstein Cows

This paper extends an analysis of the relation between live weight and milk-energy yield in cows, based on data available in the literature (cf. 1, 2). The records considered here are from the Cornell Station (3, 4) and from the Bureau of Dairy Industry (5). The former pertain to grade Holstein cows of matnre age; the latter, to pure-bred half-sister Holstein cows as first-calf heifers and at mature age. CORNELL DATA These represent a feeding trial designed to test the effect of concentrate rations differing in per cent of total protein for 3 successive seasons. They include the initial live weight of each cow and her milk and fat yield for the first 40 weeks of lactation in the first and second seasons and the first 37 weeks in the third season.