Genetic studies on production, fertility and longevity traits in Murrah and Nili-Ravi buffaloes
KrishiKosh
View Archive InfoField | Value | |
Title |
Genetic studies on production, fertility and longevity traits in Murrah and Nili-Ravi buffaloes
|
|
Creator |
Chaudhari, Mahavir
|
|
Contributor |
SIKKA, A. K.
|
|
Subject |
Correlation, Heritability, Milk yield, Murrah, Nili-Ravi buffaloes, Selection index, Trend
|
|
Description |
The data on performance records of 3712 buffaloes, which includes 2132 Murrah and 1580 Nili--Ravi, progeny of 170 and 126 sires, respectively; calved during the year 1992 to 2013, maintained at Animal Farm, CIRB, Hisar and Sub-Campus, Nabha were analyzed by least squares method using mixed model comprising of sire effect as random, period of calving, season of calving and parity as fixed effect and age at first calving as covariate. The genetic and phenotypic trends for production and fertility traits were estimated by regression procedure. The single trait animal model was considered for estimation of breeding values using WOMBAT software. The selection indices for various first lactation traits were constructed. The least-squares means for TLMY, 305 DMY, PY, LL, MY/LL, MY/CI, DP, SP and CI were 2043.33±28.47 kg, 1972.21±23.37 kg, 10.14± 0.09 kg, 303.23±2.76 days, 6.81±0.08 kg/day, 4.89±0.07 kg/day, 168.45±4.08 days, 171.04±5.55 days and 479.83±5.90 days, respectively in Murrah buffaloes. The least-squares means for LTY, PLF, UPL and HLF were 7789.79±241.64 kg, 1161.00±30.35 days, 504.62±11.85 days and 3194.47±45.59 days, respectively. The least-squares means for TLMY, 305 DMY, PY, LL, MY/LL, MY/CI, DP, SP and CI were 1941.44±148.19 kg, 1913.87±133.61 kg, 10.13±0.68 kg, 295.90±13.94 days, 6.83±0.08 kg/day, 4.68±0.07 kg/day, 142.99±15.81 days, 150.78±16.53 days and 462.30±16.74 days, respectively in Nili-Ravi buffaloes. The least-squares means for LTY, PLF, UPL and HLF were 5763.85±225.29 kg, 900.95±29.53 days, 369.91±10.77 days and 2502.45±45.05 days, respectively. The estimates of heritability for all lactation production traits were moderate to high (0.294±0.072 to 0.461±0.087) except low for LL, in both the breeds. The estimates of heritability for all lactation fertility traits were low (0.094±0.080 to 0.221±0.081) in both the breeds, similarly for first and second lactation traits in Murrah buffaloes. This moderate estimate of heritability for milk yield suggest that good possibility exists for further improvement of these traits through proper selection programme. The low heritability estimate for fertility traits indicates that these traits influenced more by managemental and environmental factors than by genetic factors. The estimates of heritability for all lifetime traits were low to high (0.197±0.147 to 0.437±0.129) in both the breeds. The genetic and phenotypic correlation of TLMY was high and positive with 305 DMY (0.983±0.008 and 0.940±0.014) and PY (0.852±0.065 and 0.549±0.038) in both the breeds, similarly for the first and second lactation production traits. The high genetic correlations of PY with TLMY and 305 DMY suggested that peak yield may be the best trait to be taken in to selection criteria for improvement of milk production in Murrah and Nili-Ravi buffaloes. The genetic and phenotypic correlation of DP was high and positive with SP and CI in Nili- Ravi buffaloes, similarly for the first and second lactation fertility traits in both the breeds except corresponding correlations of first lactation fertility traits in Nili-Ravi buffaloes were non-significant and associated with high standard error. All the lifetime performance traits had moderate to high and positive (0.244±0.132 to 0.966±0.071) genetic and phenotypic correlations among themselves in Murrah and Nili-Ravi buffaloes. The FLY and F305MY had moderate and positive genetic correlation with LTY and PLF, respectively. The phenotypic trend was statistically significant for FLY, F305MY, FPY, AFC, FDP and FCI, and in desirable direction, whereas genetic trend was significant for F305MY and FCI in Murrah buffalo. Trends in FLY associated with high and positive environmental trend, which indicated good management and environment condition in herd. The phenotypic trends were statistically significant for FLY, F305MY, FLL, FPY, AFC, FSP, FCI and were in desirable direction, whereas genetic trends were significant for AFC and FSP, but not in desirable direction in Nili- Ravi buffaloes. Twenty six multi trait selection indices were developed by incorporating first lactation traits in Murrah and Nili-Ravi buffaloes separately. The best index was I17 which include two traits i.e age at first calving and first 305 day or less milk yield having relative efficiency of 96.96 per cent and 98.20 per cent, respectively |
|
Date |
2016-08-17T10:34:40Z
2016-08-17T10:34:40Z 2015 |
|
Type |
Thesis
|
|
Identifier |
http://krishikosh.egranth.ac.in/handle/1/72685
|
|
Language |
en
|
|
Format |
application/pdf
|
|
Publisher |
LUVAS
|
|