1. The Digestible Energy Requirements of Lactating Pony Mares
- Author
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T.R. Rounsaville, Harold F. Hintz, and J. D. Pagan
- Subjects
endocrine system ,Meal ,Veterinary medicine ,biology ,urogenital system ,Pony ,Withers ,animal diseases ,Weight change ,Soybean meal ,General Medicine ,Animal science ,medicine.anatomical_structure ,Foal ,Latin square ,biology.animal ,Lactation ,Genetics ,medicine ,Animal Science and Zoology ,sense organs ,reproductive and urinary physiology ,Food Science - Abstract
THE DIGESTIBLE ENERGY REQUIREMENTS OF LACTATING PONY MARES J. D. Pagan, H. F. Hintz and T. R. Rounsaville Cornell University, Ithaca, NY 14853 Summary The energy requirements of lactating pony mares were studied. Twenty-two mares were divided into three groups and fed one of three diets consisting of different ratios of corn, alfalfa meal and soybean meal. All three diets were fed at a level of intake that supplied the National Research Council (NRC) recom- mended amount of crude protein for pony mares during the first 3 mo of lactation. Diets 1, 2 and 3 supplied 93.0, 74.8 and 57.2 kcal of digestible energy (DE). kg body weight -1 9 d -1 , respectively. The DE content of each diet was determined in a 3 “ 3 Latin square di- gestion trial using mature pony geldings fed at a rate of 1.5 % body weight/d. Mares and foals remained on trial for an 11-wk period. The mares and foals were weighed each week, and foal heart girths and heights at withers were measured. Least-squares regression of foal average daily gain with mare weight and energy intake of the mare as independent variables showed no significant effect of energy intake of the mare on foal growth. A regression equation that describes the influence of energy intake of the mare on mare weight change is Y = .0031-.0033
- Published
- 1984
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