{"id":14060,"date":"2022-06-24T04:51:53","date_gmt":"2022-06-24T04:51:53","guid":{"rendered":"https:\/\/file.currentschoolnews.com\/?post_type=product&p=14060"},"modified":"2022-06-24T10:36:39","modified_gmt":"2022-06-24T10:36:39","slug":"evaluation-of-production-traits-in-two-strains-of-layer-chickens-under-relaxed-selection","status":"publish","type":"product","link":"https:\/\/pastexamquestions.com\/product\/evaluation-of-production-traits-in-two-strains-of-layer-chickens-under-relaxed-selection\/","title":{"rendered":"Evaluation of Production Traits in Two Strains of Layer Chickens under Relaxed Selection"},"content":{"rendered":"

– Evaluation of Production Traits in Two Strains of Layer Chickens under Relaxed Selection –<\/strong><\/span><\/p>\n

Download Evaluation of Production Traits in Two Strains of Layer Chickens under Relaxed Selection<\/strong><\/span>. Animal Science students who are writing their projects can get this material to aid their research work.<\/span><\/span><\/p>\n

Abstract<\/b><\/span><\/h2>\n

This study was conducted to determine strain differences on some production and egg quality traits in 200 birds of synthesized Grand Parent Stock (Male and female lines) under relaxed selection. The hens used were from the same hatch and under the same management practices.<\/p>\n

Production traits studied were age at sexual\u00a0 maturity\u00a0 (ASM), body weight at 18 and 20 weeks of age (BW18 and BW20), egg number (EN), average egg weight (AEW), and rate of lay (RL).<\/p>\n

Egg weight (Ewt), egg length (El), egg width (Ewdt), albumen weight (Albwt), yolk weight (Ywt), shell weight (Swt) albumen height (Albht), yolk height (Yht), shell thickness (Sth) were measured.<\/p>\n

Haugh\u2019s unit (HU) and shell index (SI) were also obtained for egg quality traits. Significant differences (P <\u00a0 0.05) were obtained for ASM, AEW and BW20 between strains. Male line had higher mean values in ASM (161.50 days) and AEW (43.66g) but Female line had better mean value for ASM (158.79days).<\/p>\n

For egg quality traits, significant (P < 0.05) differences\u00a0 were also observed in Ewt, El, Ywt, Swt and HU. Higher mean values were obtained for all traits (Ewt, El, Ywt, and Swt) with the exception of HU in the Female line than the Male line.<\/p>\n

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Introduction<\/span><\/span><\/strong><\/span><\/h2>\n

The goal of breeders is to improve the performance of their\u00a0 flock.\u00a0 One\u00a0 of the major tools available for this improvement is selection. Selection is the act of choosing those individuals that will become parents of the next generation with the aim\u00a0 of\u00a0 improving\u00a0 the performance of the flock or population.<\/p>\n

The\u00a0 various selection methods used\u00a0 based\u00a0 on phenotypic measurement includes: mass selection, progeny testing, tandem selection, independent culling level, and selection index (Bourdon, 2000). Genetic improvement in animals and plants\u00a0 for\u00a0 food\u00a0 consumption has\u00a0 been practised and realised since domestication.<\/p>\n

Intensive\u00a0 improvement,\u00a0 increasingly\u00a0 with incorporation of genetic principles, has been undertaken for a century or more (Hill, 2008). Much of this has been highly intensive and\u00a0 effective,\u00a0 notably in poultry.\u00a0 There are consequently concerns that genetic variation is being exhausted and continued gains cannot be expected (Hill, 2008).<\/p>\n

The genetics of a metric character centres round the\u00a0 study of its variation (Falconer and Mackay, 1996). It is assumed that genetic variances either remains constant during selection or that any changes in variance can be predicted solely from the variance components of the base population.<\/p>\n

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