Studies on Genetic and Phenotypic Parameters of Some Economic Traits in Diferent Grades of Cross-bred (Friesian X Zebu) Cattle PDF Download
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Author: Siya Ram Singh
Publisher:
ISBN:
Category :
Languages : en
Pages : 327
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Author: Siya Ram Singh
Publisher:
ISBN:
Category :
Languages : en
Pages : 327
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Author: A. K. Shrivastava
Publisher:
ISBN:
Category :
Languages : en
Pages : 385
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Author: C. O. Reddy
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Investigations were carried out to study the relationship of profit function, life production and herd life with reproductive variables and to study the relationship between first lactation and lifetime performance and to estimate the economic returns on the basis of first lactation performance. The least square analysis showed that the differences between the two genetic groups (higher and lower crosses) were significant for all the production and profit traits. Similarly the genetic group did not show significant differences in reproductive raits viz., number of inseminations per conception (1.69 and 1.74), firsst calving interval (423 and 426 days), days open percent (36.66 and 37.13) and weight at first calving (306 and 384 kg). Based on profit per day of lif an open period of 135 days in higher crosses and 134 days in lower crosses were found to be satisfactory. The days dry were optimised at 34.22 percent 26.98 percent, 20.22 percent, 24.84 percent and 24.11 percent, for hrd life, lifetime milk yield, milk yield per day of herd life, lifetime profit and profit per day of herd life in higher crosse, respectively. It was also observed that, one standard deviation decrease in mean days dry percent could maximise all the lifetime production traits in lower crosses. Long herd life was found to be necessary for maximum profit and profit per day of herd life. The age at first calving accounted for little in all the lifetime traits in both higher and lower crosses (3.11 to 5.54 percent and 0.07 to 2.11 percent). Similar observations were made with the weight at first calving. Herd life increased gradually upto first lactation (2500 kg) in lower crosses and 3000 kg in higher crosses. Increase in first lactation increased the lifetime traits. The genetic correlations between first lactation traits and lifetime traits were higher in higher crosses. Th phenotypic corrlations among lifetime traits were positive and significant except the correlations of days dry percent with other lifetime traits.
Author: Mekonnen Haile-Mariam
Publisher:
ISBN:
Category : Boran cattle
Languages : en
Pages : 140
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Author: Aynalem Haile Gebale
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 1852
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Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 1280
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Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 1194
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Author: International Livestock Centre for Africa
Publisher: ILRI (aka ILCA and ILRAD)
ISBN:
Category :
Languages : en
Pages : 124
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Author: Kelsey M. Rolfe
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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