Citation
Suzuki T., . and Takusari N., . and Kurihara M., . and Nonaka I., . and Tajima K., . (2004) Effects of high environmental temperatures on physiological and nutritional status of prepuberal Holstein heifers. [Proceedings Paper]
Abstract
We evaluated the effects of environmental temperature and of increases therein from 20 to 28 to 33C at a constant 60 relative humidity on the physiology energy and nitrogen balance of prepubertal Holstein heifers n4 initial BW198/-3 kg. The relatively high environmental temperatures of 28 and 33 C increased rectal temperature by 0.2 and 1.2 C and the respiration rate by 23 and 58 breaths per minute respectively. At 28 C dry matter intake was similar to that at 20 C whereas at 33 DC the intake was about 10 lower. As a result of this reduced intake daily weight gain at 33 C was also reduced. The highest environmental temperatures increased hematocrit and BUN but decreased glucose concentration in plasma. Energy and nitrogen intake at 33 C was lower than at 20 and 28 C while energy and nitrogen digestibility were higher at 28 and 33 C than at 20C. Urinary nitrogen was elevated at 33 C. Consequently nitrogen retention at 33 C was significantly reduced although energy retention did not differ among the thermal treatments. This study indicated that the effects of environmental temperature on prepubertal heifers became severe above 28 C.
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Abstract
We evaluated the effects of environmental temperature and of increases therein from 20 to 28 to 33C at a constant 60 relative humidity on the physiology energy and nitrogen balance of prepubertal Holstein heifers n4 initial BW198/-3 kg. The relatively high environmental temperatures of 28 and 33 C increased rectal temperature by 0.2 and 1.2 C and the respiration rate by 23 and 58 breaths per minute respectively. At 28 C dry matter intake was similar to that at 20 C whereas at 33 DC the intake was about 10 lower. As a result of this reduced intake daily weight gain at 33 C was also reduced. The highest environmental temperatures increased hematocrit and BUN but decreased glucose concentration in plasma. Energy and nitrogen intake at 33 C was lower than at 20 and 28 C while energy and nitrogen digestibility were higher at 28 and 33 C than at 20C. Urinary nitrogen was elevated at 33 C. Consequently nitrogen retention at 33 C was significantly reduced although energy retention did not differ among the thermal treatments. This study indicated that the effects of environmental temperature on prepubertal heifers became severe above 28 C.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia HD9410.1 A111 2004 vol.3 Call Number |
| AGROVOC Term: | Heifers |
| AGROVOC Term: | Environmental temperature |
| AGROVOC Term: | Nutritional status |
| AGROVOC Term: | Energy |
| AGROVOC Term: | Nitrogen |
| AGROVOC Term: | Metabolism |
| AGROVOC Term: | Respiration rate |
| AGROVOC Term: | Weight gain |
| AGROVOC Term: | Digestibility |
| AGROVOC Term: | Nitrogen retention |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:14 |
| URI: | http://webagris.upm.edu.my/id/eprint/12022 |
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