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Protein and energy requirements for maintenance of indigenous Granadina goats

Published online by Cambridge University Press:  09 March 2007

C. Prieto ,
J. F. Aguilera ,
L. Lara  and
J. FonollÁ
C. Prieto
Affiliation:
Estación Experimental del Zaidin (EEZ), 18008 Granada, Spain
J. F. Aguilera
Affiliation:
Estación Experimental del Zaidin (EEZ), 18008 Granada, Spain
L. Lara
Affiliation:
Estación Experimental del Zaidin (EEZ), 18008 Granada, Spain
J. FonollÁ
Affiliation:
Estación Experimental del Zaidin (EEZ), 18008 Granada, Spain
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Abstract

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Sixteen adult castrated male goats of the Granadina breed, with initial live weights ranging from 26.0 to 33.3 kg were used in two experiments to determine their protein and energy requirements for maintenance. Digestibility, nitrogen and energy balance measurements were made during the experiments. Two diets, which were based on pelleted lucerne (Medicago sativa) hay alone or on this forage and barley, were individually given at about maintenance level once daily. Gas exchange was measured using open-circuit respiration chambers. Fasting heat production was also determined. By regression analysis endogenous urinary N and maintenance requirements for N were estimated to be 119 mg/kg body-weight (W)0.75 per d and 409 mg total N/kg W0.75 per d respectively. Fasting heat production was 324 kJ/kg W0.75. The energy requirement for maintenance was calculated by regression of energy balance on metabolizable energy (ME) intake and a value of 443 kJ/kg W0.75 per d was found. The overall efficiency of utilization of ME for maintenance was 0.73.

Keywords

Energy requirementProtein requirementGoats
Type
Energy metabolism and Requirements
Information
British Journal of Nutrition , Volume 63 , Issue 2 , March 1990 , pp. 155 - 163
Copyright
Copyright © The Nutrition Society 1990

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