scholarly journals Estimation of genetic parameters of weekly test-day milk yields and first lactation 305-day milk yield in Murrah buffaloes

2014 ◽  
Vol 7 (12) ◽  
pp. 1094-1098 ◽  
Author(s):  
Saroj Kumar Sahoo ◽  
Avtar Singh ◽  
A. K. Gupta ◽  
A. K. Chakravarty ◽  
Manvendra Singh ◽  
...  
Keyword(s):  
Milk Yield ◽  
Genetic Parameters ◽  
Murrah Buffaloes ◽  
Estimation Of Genetic Parameters

scholarly journals Estimation of genetic parameters for milk yield in Murrah buffaloes by Bayesian inference

2010 ◽  
Vol 93 (2) ◽  
pp. 784-791 ◽  
Author(s):  
F.C. Breda ◽  
L.G. Albuquerque ◽  
R.F. Euclydes ◽  
A.B. Bignardi ◽  
F. Baldi ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Milk Yield ◽  
Genetic Parameters ◽  
Murrah Buffaloes ◽  
Estimation Of Genetic Parameters

scholarly journals Estimation of genetic parameters and genetic trends for milk yield traits in Jamunapari goats in semiarid tropics

2017 ◽  
Vol 153 ◽  
pp. 62-65 ◽  
Author(s):  
P.K. Rout ◽  
O. Matika ◽  
R. Kaushik ◽  
M.S. Dige ◽  
G. Dass ◽  
...  
Keyword(s):  
Milk Yield ◽  
Genetic Parameters ◽  
Yield Traits ◽  
Semiarid Tropics ◽  
Estimation Of Genetic Parameters ◽  
Genetic Trends

Genetic parameters among lactational performance traits in Murrah buffaloes

2015 ◽  
Author(s):  
A. Godara ◽  
D. Singh ◽  
S. S. Dhaka
Keyword(s):  
Genetic Correlation ◽  
Milk Yield ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Research Centre ◽  
Murrah Buffaloes ◽  
Performance Traits ◽  
Lactational Performance ◽  
Almost All ◽  
Animal Sciences

The data pertinent to lactational performance traits on Murrah buffaloes calved during period 1987 to 2002, progeny of 52 sires maintained at Buffalo Research Centre, LLR University of Veterinary and Animal Sciences, Hisar were considered. The estimates of heritability were obtained low to moderate for almost all lactational performance traits. All the first lactation traits viz., AC1, SP, CI, MY, LL, PY, DAPY and MY/LL had moderate to high positive genetic correlations among themselves except PY with CI and DAPY with AC1, which is negative. Age at calving (AC2) had moderate positive genetic correlation with second lactational performance traits like SP, MY, LL, PY, MY/LL and MY/CI and had negative correlations with DAPY and DP. Moreover, third lactational traits like milk yield, LL, PY, DAPY, MY/LL and MY/CI had high positive genetic correlations among themselves. However, age at calving during fourth lactation had positive genetic correlations with all the traits except CI, DAPY and DP which had negative genetic correlations with it. It is inferred that information on sip performance and other relatives coupled with better husbandry practices would be required to bring desirable improvement in these lactational performance traits.

Genetic Analysis of First Lactation Monthly Test Day Milk Yields, Peak Yield and 305 Days Milk Yield in Murrah Buffaloes

2020 ◽  
Author(s):  
Ekta Rana ◽  
Ashok Kumar Gupta ◽  
Avtar Singh ◽  
Atish Kumar Chakravarty ◽  
Saleem Yousuf ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Milk Yield ◽  
Genetic Parameters ◽  
Correlation Method ◽  
Phenotypic Correlation ◽  
Murrah Buffaloes ◽  
National Dairy Research Institute ◽  
Genetic And Phenotypic Correlations ◽  
Breed Improvement ◽  
Selection Of

Background: The estimates of genetic parameters are useful in determining the appropriate method of selection that could further be implemented in the breed improvement programmes. The present study was, therefore, conducted to estimate the genetic parameters (heritability, genetic and phenotypic correlations) for monthly test day (TD) milk yields, peak yield (PY) and first lactation 305 days milk yield (FL305DMY) in Murrah buffaloes.Methods: Paternal half-sib correlation method was carried out by least-squares maximum likelihood programme to estimate genetic parameters of first lactation 4,209 and 408 records of monthly test day milk yield and peak yield, respectively, of 408 Murrah buffaloes (sired by 62 bulls) calved in between 1993 and 2017 at ICAR-National Dairy Research Institute, Karnal.Result: Heritability of FL305DMY and peak yield was estimated as 0.35±0.17 and 0.33±0.16, respectively. Heritability estimates for mid-lactation monthly test day milk yields were found to be moderate. Genetic correlation of monthly test day milk yields with FL305DMY was positive and highly significant for TD-4 to TD-9 and TD-11. Peak yield showed high genetic and phenotypic association with FL305DMY. High genetic and phenotypic correlation among monthly test day milk yields, peak yield and FL305DMY suggested that TD-4 to TD-9 and TD-11 test day milk yields and peak yield could be used for the selection of elite animals.

scholarly journals Estimation of genetic parameters and trends for energy-corrected 305-d milk yield in Iranian Holsteins

2012 ◽  
Vol 55 (5) ◽  
pp. 420-426
Author(s):  
N. G. Hossein-Zadeh
Keyword(s):  
Animal Models ◽  
Milk Yield ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Physiological Mechanism ◽  
Animal Breeding ◽  
Dairy Herds ◽  
Breeding Values ◽  
Estimation Of Genetic Parameters ◽  
Genetic Trends

Abstract. Calving records from the Animal Breeding Centre of Iran collected from January 1995 to December 2007 and comprising 217973 calving events of Holsteins from 704 dairy herds were analysed using univariate and bivariate linear animal models to estimate heritabilities and genetic correlations for energy-corrected 305-d milk yield (ECM) in the first three lactations of Holstein cows. Genetic trends were obtained by regressing yearly mean estimates of breeding values on calving year. Average ECM increased from parity 1 through parity 3. Estimates of heritabilities were from 0.14 to 0.21 for ECM and decreased over the parities. The greatest genetic correlations were between ECM2 and ECM3 (0.96), and the greatest phenotypic correlations were between ECM1 and ECM2 (0.57) and ECM2 and ECM3 (0.57). The high and positive genetic correlations between ECM traits at different lactations are evidence for common genetic and physiological mechanism controlling these traits. There were positive and increasing phenotypic and genetic trends for ECM over the years (P<0.001). Higher heritability of the ECM in the first parity along with the high genetic correlations between first-lactation ECM with these traits in other lactations shows that higher potential exists for selecting animals for ECM based on their first parity records.

scholarly journals Estimation of Genetic Parameters for Milk Yield and Fat and Protein Contents of Milk from Murciano-Granadina Goats

1996 ◽  
Vol 79 (10) ◽  
pp. 1895-1898 ◽  
Author(s):  
M. Analla ◽  
I. Jiménez-Gamero ◽  
A. Muñoz-Serrano ◽  
J.M. Serradilla ◽  
A. Falagán
Keyword(s):  
Milk Yield ◽  
Genetic Parameters ◽  
Estimation Of Genetic Parameters

scholarly journals Estimation of genetic parameters for milk yield across lactations in mixed-breed dairy goats

2014 ◽  
Vol 97 (4) ◽  
pp. 2455-2461 ◽  
Author(s):  
S. Mucha ◽  
R. Mrode ◽  
M. Coffey ◽  
J. Conington
Keyword(s):  
Milk Yield ◽  
Genetic Parameters ◽  
Dairy Goats ◽  
Mixed Breed ◽  
Estimation Of Genetic Parameters
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