Scholarlink

<p>Faster growth is necessary for reproduction, production and survival in sheep rearing. Accumulation of inbreeding in a closed flock is a reason for the reduction in performance traits. This study aimed to evaluate the impact of inbreeding on growth traits using data from 5056 Magra lambs recorded over 22&#xa0;years (1998–2020) at ICAR-CSWRI-ARC, Beechwal, Bikaner, Rajasthan, India. The mean inbreeding coefficient was 0.89% for both the male and female. The overall proportion of inbred animals was 46.42%. About 37.22% of the animals had an inbreeding level below 3%. The various ancestral inbreeding coefficients showed significant correlations with each other. The linear regression analysis revealed that each 1% increase in the inbreeding coefficient corresponded to changes of 6, 21, 45, 22, and 42&#xa0;g in body weights recorded at birth, 3, 6, 9, and 12&#xa0;months, respectively. Regression analysis showed a non-significant negative effect on most growth traits. For 12MWT, ADG3, KR3, GE1, GE3, RGR1, and RGR3, the effect was positive but still non-significant. Low levels of inbreeding were associated with slightly improved growth traits compared to higher inbreeding levels. This study showed that the effect of inbreeding increased as the age of the lambs advanced. Therefore, strategic breeding management, including controlled mating plans, the use of unrelated sires, and optimal sire rotation, is the need of the hour to achieve optimal growth at later stages.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessment and elucidation of inbreeding effects on growth performance of Magra lambs reared under arid climatic conditions

  • 期刊论文

  • 发表日期：

    2026年2月12日

查看全文
  • Ashish Chopra,
  • Jayesh Vyas,
  • Asad Khan,
  • Ashok Kumar,
  • Ram Avtar Legha

摘要

Faster growth is necessary for reproduction, production and survival in sheep rearing. Accumulation of inbreeding in a closed flock is a reason for the reduction in performance traits. This study aimed to evaluate the impact of inbreeding on growth traits using data from 5056 Magra lambs recorded over 22 years (1998–2020) at ICAR-CSWRI-ARC, Beechwal, Bikaner, Rajasthan, India. The mean inbreeding coefficient was 0.89% for both the male and female. The overall proportion of inbred animals was 46.42%. About 37.22% of the animals had an inbreeding level below 3%. The various ancestral inbreeding coefficients showed significant correlations with each other. The linear regression analysis revealed that each 1% increase in the inbreeding coefficient corresponded to changes of 6, 21, 45, 22, and 42 g in body weights recorded at birth, 3, 6, 9, and 12 months, respectively. Regression analysis showed a non-significant negative effect on most growth traits. For 12MWT, ADG3, KR3, GE1, GE3, RGR1, and RGR3, the effect was positive but still non-significant. Low levels of inbreeding were associated with slightly improved growth traits compared to higher inbreeding levels. This study showed that the effect of inbreeding increased as the age of the lambs advanced. Therefore, strategic breeding management, including controlled mating plans, the use of unrelated sires, and optimal sire rotation, is the need of the hour to achieve optimal growth at later stages.