Lactation in the horse: milk composition and intake by foals.

摘要: Milk samples averaging 500 ml were collected weekly from 10 to 54 days postpartum five lactating mares. Samples obtained by hand milking after oxytocin administration and while the foal nursed. Dry matter, protein gross energy higher in at 17 than those during midlactation period of 24-54 days. Midlactation averaged 10.5% dry 1.29% fat, 1.93% protein, 6.91% sugar 50.6 kcal/100 g. Protein comprised 22% milk energy. intake was estimated foals deuterium oxide (D2O) turnover be 16, 15 18 kg/day 11, 25 39 postpartum. differed significantly among various ages, whether expressed as a daily amount, percent body weight, per kilogram0.75 or gram weight gain. production equivalent 3.1% mare's 11 postpartum, 2.9% 3.4% On basis metabolic size output mare 149 g/kg0.75, 139 g/kg0.75 163 respectively. Nutrient intakes calculated composition data. At respectively, matter equaled 3.1, 2.1 2.0% 9380, 7590 8910 kcal. For each gain, ingested 0.37 g 8.3 kcal days, 0.26 6.7 0.30 7.8 age.