Growth curve analysis in Mecheri sheep

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dc.contributor.authorBalan, C
dc.contributor.authorKathiravan, G
dc.contributor.authorThirunavakkarasu, M
dc.contributor.authorJeichitra, V
dc.contributor.authorTANUVAS
dc.date.accessioned2020-03-10T09:17:34Z
dc.date.available2020-03-10T09:17:34Z
dc.date.issued2020-02
dc.descriptionTNV_20thMVC_PP_Feb-2020_PA58en_US
dc.description.abstractLivestock keeping is an important avocation for the poor in the developing world, especially in India, contributing to rural livelihood and offering pathways to come out of poverty. Among the livestock, the sheep is an economically important species contributing greatly to the Indian agrarian economy, playing a vital role for the livelihood of a large number of small and marginal farmers and landless labourers. In addition to meat and wool, manure from sheep is an important source of organic fertilizer, especially in southern states where they are penned on fallow lands for increasing soil fertility. Mecheri sheep are one of the recognized breeds of sheep in Tamil Nadu and reared mainly for meat with the primary by-product as skin. They constitute 24.28 per cent of total sheep population of Tamil Nadu.Data on growth traits of Mecheri lambs born between the years 1991 and 2014 in Mecheri Sheep Research Station, Pottaneri were utilized for this study. The overall least-squares means (± S.E.) of body weights at birth, 3, 6, 9 and 12 months of age were 2.37 (± 0.008), 9.61 (± 0.062), 12.56 (± 0.071), 15.32 (± 0.085) and 17.87 (± 0.102) kg, respectively. Lambs born during the months of July-September had the highest (2.44±0.018 kg) birth weight and the least birth weight (2.14 ± 0.014 kg) was found among lambs born during the months January-March. Similarly, lambs born during the periods July-September and January-March had the highest (10.06 ± 0.127 kg) and least (7.74 ± 0.099 kg) weaning weights, respectively. Also, the highest yearling weight (18.70 ± 0.216 kg) was found in lambs born during the months July-September and the least weight (16.48 ± 0.177) was found during the months January- March. The overall least-squares means of Absolute Growth Rate (g/day) measures over the age intervals of birth to 3 months, 3 to 6 months, 6 to 9 months and 9 to 12 months were 79.97 ± 0.56, 40.01 ± 0.44, 33.73 ± 0.46 and 31.34 ± 0.86, respectively. Among non-linear growth models fitted to evaluate growth pattern, the Brody function was found to be the best fitted model in describing the growth curve patterns of both ram and ewe lambs of Mecheri sheep, which was followed by Von Bertlanffy, Gompertz, Logistic and Richards models in the order of the goodness of fit. The predicted body weights through Brody model at birth, 3, 6, 9 and12 months of age were 2.57, 8.92, 13.03, 15.70 and 17.50 kg, respectively in Mecheri sheep. The study showed that the Brody function adequately fitted the growth rate of Mecheri sheep, which is a medium sized breed with moderate growth. Further, Influences of environmental factor such as months of lambing and sex of the lambs born were well captured by the Brody model.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810145130
dc.keywords20th Indian Veterinary Congress, Annual Conference of IAAVR, TANUVASen_US
dc.language.isoenen_US
dc.pages1en_US
dc.subjectVeterinary Scienceen_US
dc.titleGrowth curve analysis in Mecheri sheepen_US
dc.title.alternativeNational Symposium on Veterinary Research Priorities in Translational Animal Health, Production and Food Safetyen_US
dc.typePresentationen_US
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