Correlated responses in productive and adaptive traits and temperament following selection for growth and heat resistance in tropical beef cattle

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• 作者：Burrow ; H.M. ; Prayaga ; K.C.
• 关键词：Direct response ; Correlated response ; Genetic trends ; Growth ; Adaptation ; Temperament ; Male and female fertility ; Beef cattle
• 刊名：Livestock Production Science
• 出版年：2004
• 出版时间：March, 2004
• 年：2004
• 卷：86
• 期：1-3
• 页码：143-161
• 全文大小：352 K

文摘

Selection experiments were established in zebu-derived beef cattle grazed at pasture in the tropics to determine direct and correlated responses to selection. Two lines (AX and UPWT) that differed marginally in their level of adaptation to environmental stressors were selected for high growth, measured by estimated breeding value (EBV) for weight at 600 days. A third line (TEMP) was selected for resistance to heat, measured by low EBV for repeated records of rectal temperature under conditions of heat stress. A control line, CONT (AXBX), was also established, with minimum selection differential for 600-day weight. A derived control line, CONT (AX), based on differences between AX and AXBX lines in the foundation generation was used with CONT (AXBX) and genetic trends to measure responses.