DIRECT AND CORRELATED RESPONSE TO INDIVIDUAL SELECTION IN PHULE TRIVENI
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Date
2017
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Mahatma Phule Krishi Vidyapeeth, Rahuri.
Abstract
The data on first lactational and lifetime milk production traits of Phule Triveni cows maintained at R.C.D.P. on Cattle, M.P.K.V., Rahuri (Maharashtra) was collected and analysed by least squares technique (Harvey, 1990) to estimate the effect of period of birth, season of birth, period of calving and season of calving. The genotypic and phenotypic correlation, heritability, direct and correlated responce among the first lactation and lifetime production traits under study were also studied. The overall least squares mean for BW, AFC, 305DMY, TMY, LL, DP, SP, CI, MY/LL, MY/CI, NLC, HL, L305DMY, LTMY, TDM, MY/TDM and MY/HL were 24.20 ± 0.33 kg, 962.12 ± 10.95 days, 2817.65 ± 27.87 kg, 3014.15 ± 31.06 kg, 332.60 ± 2.11 days, 113.14 ± 2.86 days, 166.19 ± 3.49 days, 446.09 ± 3.49 days, 9.08 ± 0.07 days, 7.10 ± 0.08 days, 4.64 ± 0.14, 2935.83 ± 80.71 days, 10182.90 ± 412.44 kg, 11674.21 ± 497.97 kg, 1325.31 ± 51.79 days, 9.32 ± 0.87 days and 4.03 ± 0.14 kg, respectively in Phule Triveni. The effect of period of birth on AFC and BW was significant (P<0.01). The effect of season of birth on AFC and BW was non-significant in Phule Triveni. The effect of period of calving on 305DMY, TMY, LL, MY/LL and MY/CI was significant (P<0.01) while it was non-significant on DP, SP, CI, NLC, HL, L305DMY, LTMY, TDM, MY/TDM and MY/HL. The effect of season of calving on 305DMY was significant (P<0.01) while it was non-significant on TMY, LL, DP, SP, CI, MY/LL, MY/CI, NLC, HL, L305DMY, LTMY, TDM, MY/TDM and MY/HL in Phule Triveni. The effect of sire on BW, 305DMY, TMY, DP, SP, CI, MY/LL, MY/CI, HL, L305DMY, LTMY, TDM and MY/HL was significant (P<0.01) while it was non-significant on AFC, LL, NLC, and MY/TDM in Phule Triveni. Heritability for BW, AFC, 305DMY, TMY, LL, DP, SP, CI, MY/LL, MY/CI, NLC, HL, L305DMY, LTMY, TDM, MY/TDM and MY/HL were 0.571 ± 0.03, 0.239 ± 0.06, 0.421 ± 0.08, 0.4195 ± 0.09, 0.338 ± 0.05, 0.251 ± 0.06, 0.554 ± 0.07, 0.457 ± 0.07, 0.453 ± 0.08, 0.519 ± 0.09, 0.276 ± 0.08, 0.120 ± 0.08, 0.361 ± 0.09, 0.273 ± 0.09, 0.441 ± 0.09, 0.145 ± 0.07 and 0.147 ± 0.08, respectively. The value of expected direct response to selection in lifetime traits for NLC, HL, L305DMY, LTMY, TDM, MY/TDM and MY/HL were 0.080, 19.245 days, 299.434 kg, 270.807 kg, 44.539 days, 0.279 kg and 0.041 kg. The value of expected correlated response to selection in lifetime traits for NLC, HL, L305DMY, LTMY, TDM, MY/TDM and MY/HL were 0.0013 lactations, 0.0042 days, 0.0051 kg, 0.0065 kg, 0.0178 days, -0.0046 kg and 0.0036 kg, respectively. However, the genetic improvement by direct selection (direct response) in all the lifetime traits was higher than the indirect selection. These results do indicate that direct selection for lifetime traits should be made rather than indirect selection.
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