Effect of shearing on growth performance water balance thyroid activity and heat production of crossbred rams

Mohamad Aziz Dollah, . Effect of shearing on growth performance water balance thyroid activity and heat production of crossbred rams. pp. 83-90. ISSN 0128-0686

The effect of shearing on the growth performance of F1 DH and ISM crossbreds was studied on two groups of growing rams. The sheep were released for grazing in the open pasture during the day (0800-1500 h) and kept in the shade at night. In one of the groups the rams were shorn after they had reached the age of 8 months and then at 6 months intervals. Body weight and growth rate of shorn rams up to the age of 16 months were significantly higher (p 0.05) than unshorn rams with the respective value of 36.7 kg and 50.7 g/day; and 34.4 kg and 44.0 g/day. The water turnover rate of the shorn rams (108 mL/day/kg 0.82) was higher (p 0.05) compared to the unshorn rams (87.1 mL/day/kg 0.82). The shorn rams also had significantly higher (p 0.05) plasma triiodothyronine and thyroxine (0.80-1.08 ng/mL and 49.60-56.10 ng/mL respectively) compared to unshorn rams (0.62-0.82 and 39.8-42.00 ng/mL respectively). The mean values of heat production were similarly higher (p 0.05) in shorn rams (3.77-6.58 kcal/h/kg 0.82) than the unshorn rams (3.38-5.38 kcal/h/kg 0.82). The study concluded that shearing increased the growth performance of growing rams. The shearing had improved the heat and thyroid hormone balance which then improved the metabolic processes. It is therefore recommended that shearing should be practised as part of management system of F1 crossbreds especially when they are managed under open grazing system.

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Abstract

The effect of shearing on the growth performance of F1 DH and ISM crossbreds was studied on two groups of growing rams. The sheep were released for grazing in the open pasture during the day (0800-1500 h) and kept in the shade at night. In one of the groups the rams were shorn after they had reached the age of 8 months and then at 6 months intervals. Body weight and growth rate of shorn rams up to the age of 16 months were significantly higher (p 0.05) than unshorn rams with the respective value of 36.7 kg and 50.7 g/day; and 34.4 kg and 44.0 g/day. The water turnover rate of the shorn rams (108 mL/day/kg 0.82) was higher (p 0.05) compared to the unshorn rams (87.1 mL/day/kg 0.82). The shorn rams also had significantly higher (p 0.05) plasma triiodothyronine and thyroxine (0.80-1.08 ng/mL and 49.60-56.10 ng/mL respectively) compared to unshorn rams (0.62-0.82 and 39.8-42.00 ng/mL respectively). The mean values of heat production were similarly higher (p 0.05) in shorn rams (3.77-6.58 kcal/h/kg 0.82) than the unshorn rams (3.38-5.38 kcal/h/kg 0.82). The study concluded that shearing increased the growth performance of growing rams. The shearing had improved the heat and thyroid hormone balance which then improved the metabolic processes. It is therefore recommended that shearing should be practised as part of management system of F1 crossbreds especially when they are managed under open grazing system.

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Item Type:	Article
Additional Information:	1 graph; 1 table; 26 ref. Summary (En Malay)
AGROVOC Term:	MORUECO
AGROVOC Term:	BALANCE HIDRICO
AGROVOC Term:	TIROXINA/ ESQUILEO
AGROVOC Term:	INDICE DE CRECIMIENTO
AGROVOC Term:	TERMORREGULACION
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:55
URI:	http://webagris.upm.edu.my/id/eprint/20035

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