A comparative slaughter trial was conducted to determine the energy and protein requirements
for growth of castrated male Saanen goats weighing from 20 to 35 kg body weight
(BW). Regarding maintenance requirements, 36 castrated male Saanen goats with an initial
BW of 20.7 ± 0.5 kg, and aged 3.3 ± 0.6 months, were used. Nine animals were randomly
chosen and slaughtered at the beginning of the experimental phase (BW of 21.0 ± 0.4 kg),
representing the baseline (BL) group. The 27 remaining castrated male goats were pairfed
into nine groups (blocks) of three animals each, fed either ad libitum or restricted to
30 or 60% of ad libitum intake. A group was slaughtered when the animal fed ad libitum
reached 35 kg BW. Regarding requirements for gain, 27 castrated male Saanen goats were
fed ad libitum and nine were slaughtered at 21.0 ± 0.4 kg BW, nine at 27.7 ± 0.5 kg BW and
nine at 35.1 ± 0.3 kg BW. The BL and ad libitum-fed animals used to determine maintenance
requirements were also used to estimate gain requirements. The net energy (NE) requirement
for maintenance was 261.5 kJ/kg0.75 BW. The metabolizable energy (ME) requirement
for maintenance was 404.2 kJ/kg0.75 BW; therefore, the partial efficiency of use of ME for NE
was 0.65. The minimal endogenous N losses were 262 ± 48.4 mg N/kg0.75 empty BW (EBW),
corresponding to a net protein requirement for maintenance of 1.39 ± 0.257 g/kg0.75 BW.
The net energy for gain increased by approximately 40% (from 12 to 17 MJ/kg EBW gain)
and the net protein for gain slightly decreased by 3% (from 166 to 160 g/kg EBW gain) as the
BW increased from 20 to 35 kg. Our study contributes to the improvement of goat nutrition
because it provides estimates of the protein and energy requirements of castrated male
Saanen goats.
A comparative slaughter trial was conducted to determine the energy and protein requirementsfor growth of castrated male Saanen goats weighing from 20 to 35 kg body weight(BW). Regarding maintenance requirements, 36 castrated male Saanen goats with an initialBW of 20.7 ± 0.5 kg, and aged 3.3 ± 0.6 months, were used. Nine animals were randomlychosen and slaughtered at the beginning of the experimental phase (BW of 21.0 ± 0.4 kg),representing the baseline (BL) group. The 27 remaining castrated male goats were pairfedinto nine groups (blocks) of three animals each, fed either ad libitum or restricted to30 or 60% of ad libitum intake. A group was slaughtered when the animal fed ad libitumreached 35 kg BW. Regarding requirements for gain, 27 castrated male Saanen goats werefed ad libitum and nine were slaughtered at 21.0 ± 0.4 kg BW, nine at 27.7 ± 0.5 kg BW andnine at 35.1 ± 0.3 kg BW. The BL and ad libitum-fed animals used to determine maintenancerequirements were also used to estimate gain requirements. The net energy (NE) requirementfor maintenance was 261.5 kJ/kg0.75 BW. The metabolizable energy (ME) requirementfor maintenance was 404.2 kJ/kg0.75 BW; therefore, the partial efficiency of use of ME for NEwas 0.65. The minimal endogenous N losses were 262 ± 48.4 mg N/kg0.75 empty BW (EBW),corresponding to a net protein requirement for maintenance of 1.39 ± 0.257 g/kg0.75 BW.The net energy for gain increased by approximately 40% (from 12 to 17 MJ/kg EBW gain)and the net protein for gain slightly decreased by 3% (from 166 to 160 g/kg EBW gain) as theBW increased from 20 to 35 kg. Our study contributes to the improvement of goat nutritionbecause it provides estimates of the protein and energy requirements of castrated maleSaanen goats.
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A comparative slaughter trial was conducted to determine the energy and protein requirements
for growth of castrated male Saanen goats weighing from 20 to 35 kg body weight
(BW). Regarding maintenance requirements, 36 castrated male Saanen goats with an initial
BW of 20.7 ± 0.5 kg, and aged 3.3 ± 0.6 months, were used. Nine animals were randomly
chosen and slaughtered at the beginning of the experimental phase (BW of 21.0 ± 0.4 kg),
representing the baseline (BL) group. The 27 remaining castrated male goats were pairfed
into nine groups (blocks) of three animals each, fed either ad libitum or restricted to
30 or 60% of ad libitum intake. A group was slaughtered when the animal fed ad libitum
reached 35 kg BW. Regarding requirements for gain, 27 castrated male Saanen goats were
fed ad libitum and nine were slaughtered at 21.0 ± 0.4 kg BW, nine at 27.7 ± 0.5 kg BW and
nine at 35.1 ± 0.3 kg BW. The BL and ad libitum-fed animals used to determine maintenance
requirements were also used to estimate gain requirements. The net energy (NE) requirement
for maintenance was 261.5 kJ/kg0.75 BW. The metabolizable energy (ME) requirement
for maintenance was 404.2 kJ/kg0.75 BW; therefore, the partial efficiency of use of ME for NE
was 0.65. The minimal endogenous N losses were 262 ± 48.4 mg N/kg0.75 empty BW (EBW),
corresponding to a net protein requirement for maintenance of 1.39 ± 0.257 g/kg0.75 BW.
The net energy for gain increased by approximately 40% (from 12 to 17 MJ/kg EBW gain)
and the net protein for gain slightly decreased by 3% (from 166 to 160 g/kg EBW gain) as the
BW increased from 20 to 35 kg. Our study contributes to the improvement of goat nutrition
because it provides estimates of the protein and energy requirements of castrated male
Saanen goats.
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