DIRECT AND CORRELATED RESPONSE OF INDIVIDUAL SELECTION OF DECCANI SHEEP
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Date
2017
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The investigation entitled, “Direct and correlated response of individual selection of Deccani sheep” was undertaken at Network Project on Sheep Improvement, Deccani farm base unit, Mahatma Phule Krishi Vidyapeeth, Rahuri (Maharashtra). The data on the growth traits of Deccani sheep for the investigation were collected from the History and Pedegree sheet maintained for the period from 2001 to 2015. The semi intensive system of management was followed at project. The animals were allowed to graze in morning hours. Concentrates are supplemented along with green and dry fodder.The newly born lambs were kept with dams in lambing pen for 15 days. All important management and health practices were followed on the farm. The analysis of data was made by using least squares technique as suggested by Harvey (1990) for estimate effect of different genetic and non- genetic factors. The effect of season of birth, period of birth, sex and sire on various growth traits were estimated. Estimated overall least square means for birth, 3, 6, 9 and 12 months of age of Deccani sheep were 3.230.09, 12.710.06, 18.360.08, 21.240.09 and 23.880.09 kg, respectively. The effect of period of birth, season of birth, sex and sire were significant on body weight at all stages of growth. The estimates of heritability were 0.980.016, 0.1550.017, 0.3810.019, 0.4690.020 and 0.3730.019 for birth, 3, 6, 9 and 12 months of age, respectively. Genotypic and phenotypic correlations among different traits were also estimated. The positive and highly significant genetic and phenotypic correlations were obtained at various stages of growth. Highest direct and correlated response was observed at 9 months of age. The genetic improvement could be achieved by direct selection based on 9 months body weight in Deccani sheep.
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null, DECCANI SHEEP