Heat tolerance in 1/2 Senepol- and 5/8 Holstein- 3/8 Brahman crossbred calves.

被引：0

作者：

Quintero-Moreno, Armando

Calatayud, Derwin

Boscan, Julio

Rojas, Nidia

Arrieta, Darwuin

Palomares, Roberto

机构：

[1] Univ Zulia, Fac Ciencias Vet, Unidad Prod Anim, Maracaibo 4005 A, Venezuela

[2] Univ Zulia, Fac Ciencias Vet, Unidad Reprod Anim, Maracaibo 4005-A, Venezuela

[3] Cent Univ Venezuela, Fac Ciencias Vet, Catedra Farmacol & Toxicol Vet, Caracas, Venezuela

来源：

REVISTA CIENTIFICA-FACULTAD DE CIENCIAS VETERINARIAS | 2007年 / 17卷 / 05期

关键词：

adaptation; heat tolerance; crossbred; tropics; calf;

D O I：

暂无

中图分类号：

S85 [动物医学（兽医学）];

学科分类号：

0906 ;

摘要：

Two trials were conducted to determine heat tolerance between crossbred 1/2 Senepol- (S-) and 5/8 Holstein-3/8 Brahman (NB). Differences between crossbred in trial 1, and crossbred and ambient temperature (Ta: 25 and 34 degrees C) in trial 2 were evaluated through rectal temperature (Tre), respiration rate (RR), heat tolerance index (HTC), coefficient of adaptability (CA), average daily gain (ADG), and plasma cortisol. Trial 1 used 324 observations in 18 S- calves and 12 HB calves, while trial 2 used 90 observations in 8 S- calves and 7 HB calves. The statistical analysis of the parameters evaluated was carried out by mixed model with repeated measurements, while-means the ADG was perform by T-test. In trial 1, S- and HB calves had similar heat tolerance (P>0.05). In trial 2, Tre and RR in HB were greater (P<0.05) than S- calves, and also HTC, CA and ADG were the best in S-. At 34 degrees C of Ta, the HB calves had significantly (P<0.05) greater Tre, and lower HTC than S-calves (P<0.01). The results demonstrate the great heat tolerance of the crossbred Senepol.

引用

页码：473 / 479

页数：7

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