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Liveweight and Milk-Energy Yield at Various Feeding Intensities¹

University of Illinois, Urbana

ABSTRACT

The relation of liveweight in pounds within 5 weeks after calving, W₁, to milk-energy yield for the 35-week partial lactation in pounds of 4 per cent milk per day, FCM₈, is investigated by adjusting the equation, FCMg/Wi = a bW₁, to observations from the Input-Output experiment of the Bureau of Dairy Industry. For all lactations (255), b is not significantly different from zero. The postulate that FCM₈ tends to be proportional to W₁ is valid so far as indicated by this body of observations on five breeds of dairy cows taken as a whole. Essentially the same relation holds for each feeding-intensity class (83 to 183 per cent of Haecker). However, as between feeding-intensity classes, there is a consistent tendency for b to decrease as feeding intensity increases. The consistency of this tendency may give it some meaning.

¹ The authors are indebted to O. E. Reed, Chief of the Bureau of Dairy Industry, for administrative approval of the present use of the records of the Input-Output investigation; also, to T. E. Woodward, Bureau of Dairy Industry, for painstaking care in providing photostatie copies of the weekly records maintained by the Bureau in conduct of the original investigation.

² Now at Cornell University, Ithaca, New York.