Abstract
Data collected on metabolizable energy (ME) intake and growth performance of preruminant female kids of the Murciano-Granadina breed was used to assess the accuracy of the latest U. S. National Research Council (NRC) recommendations to predict their energy requirements. Female kids were fed a milk replacer individually, according to appetite three times a day from two to five weeks of age. The mean initial body weight and average daily weight gain (± SE) were 3.31 ± 0.08 kg/d and 120 ± 3 g/d. Daily ME intake, expressed relative to metabolic body weight (BW0.75), decreased linearly with age from 1085 to 970 kJ/kg BW0.75/d, and there was nearly a constant ratio of ME requirements for maintenance. The observed ME intake was 5.4% higher than the ME requirements, calculated according to NRC, probably due to the energy content of the weight gain. It was concluded that the energy system model of the NRC is accurate enough to calculate the ME requirements of preruminant female kids of the Murciano-Granadina breed.Keywords: Goats, pre-weaning period, suckling female kids, NRC
Highlights
Data collected on metabolizable energy (ME) intake and growth performance of preruminant female kids of the Murciano-Granadina breed was used to assess the accuracy of the latest U
Most studies conducted on preruminant kids have focused on metabolizable energy (ME) intake and growth performance of male kids (Jagusch et al, 1983; Sanz Sampelayo et al, 1988; Bezabih & Pfeffer, 2003)
Gender differences were taken into account only to calculate the ME requirements for maintenance (MEm) and a common value for all sex classes was used to calculate the ME content of the weight gain
Summary
Data collected on metabolizable energy (ME) intake and growth performance of preruminant female kids of the Murciano-Granadina breed was used to assess the accuracy of the latest U. Most studies conducted on preruminant kids have focused on metabolizable energy (ME) intake and growth performance of male kids (Jagusch et al, 1983; Sanz Sampelayo et al, 1988; Bezabih & Pfeffer, 2003).
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