Some physiological responses of imported dorset sheep as observed in the shade

Abdul Wahid S., . Some physiological responses of imported dorset sheep as observed in the shade. pp. 164-168. ISSN 0126-5709

Ewes of pure bred Dorset Horn (DH) and Polled Dorset (PD) both imported from New Zealand and indigenous sheep of Malaysia (ISM) five of each breed were used to study the adaptation of the imported Dorset breeds to the Malaysian tropical climate. After ten days of initial adjustment in the shade rectal temperature respiration rate and pulse rate were recorded at 0800 hours and 1400 hours daily for three days. Environmental air temperature and relative humidity were also recorded. The results showed that the morning and afternoon rectal temperatures of PD DH and ISM were 39.270.32 and 39.570.40 38.940.25 and 39.270.27 and 38.700.45 and 39.270.31 deg C which were within the normal range of 39.01.5 deg. The rectal temperature increased with the increase in environmental air temperature in the afternoon. This was followed by an increase in respiration rate which was a sign of high heat load particularly in exotic breeds. The pulse rate of PD increased significantly (P 0.05) and the increase was highly significant (P 0.01) in DH and ISM sheep. In the afternoon the values of Benezra's index of adaptability (BIA) were higher in both imported breeds as compared with that of ISM (6.70 and 6.79 vs 3.85) while the Rhoad's coefficients of heat tolerance (RCHT) for PD (89.80) and ISM (94.00) were lower than that of DH (95.20) which indicated that PD had lower capability than DH in adapting to local environment even under the shade

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Abstract

Ewes of pure bred Dorset Horn (DH) and Polled Dorset (PD) both imported from New Zealand and indigenous sheep of Malaysia (ISM) five of each breed were used to study the adaptation of the imported Dorset breeds to the Malaysian tropical climate. After ten days of initial adjustment in the shade rectal temperature respiration rate and pulse rate were recorded at 0800 hours and 1400 hours daily for three days. Environmental air temperature and relative humidity were also recorded. The results showed that the morning and afternoon rectal temperatures of PD DH and ISM were 39.270.32 and 39.570.40 38.940.25 and 39.270.27 and 38.700.45 and 39.270.31 deg C which were within the normal range of 39.01.5 deg. The rectal temperature increased with the increase in environmental air temperature in the afternoon. This was followed by an increase in respiration rate which was a sign of high heat load particularly in exotic breeds. The pulse rate of PD increased significantly (P 0.05) and the increase was highly significant (P 0.01) in DH and ISM sheep. In the afternoon the values of Benezra's index of adaptability (BIA) were higher in both imported breeds as compared with that of ISM (6.70 and 6.79 vs 3.85) while the Rhoad's coefficients of heat tolerance (RCHT) for PD (89.80) and ISM (94.00) were lower than that of DH (95.20) which indicated that PD had lower capability than DH in adapting to local environment even under the shade

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Item Type:	Article
Additional Information:	4 tables; 21 ref. Summaries (En Malay)
AGROVOC Term:	OVINOS
AGROVOC Term:	TEMPERATURA DEL CUERPO
AGROVOC Term:	CIRCULACION SANGUINEA
AGROVOC Term:	MALASIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:53
URI:	http://webagris.upm.edu.my/id/eprint/18557

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