Genetic and phenotypic parameters for productive traits in the first three lactations of Khuzestan buffaloes in Iran

Madad, Mostafa; Hossein-Zadeh, Navid Ghavi; Shadparvar, Abdol Ahad

doi:10.7482/0003-9438-56-041

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…The present unadjusted means of FLMY, FLP, FLDM, AFC, FDO, and FCI were 1546.5kg, 189d, 7.9kg, 37.9mo, 120.8d and 428d, respectively are given in Table 1. The current mean of FLMY was lower than that observed by Madad et al (2013) being 2220.03 kg in Khuzestan buffaloes and higher than that observed by Shalaby et al (2016) being 1057kg in Egyptian buffaloes. The present FLP and FCI were shorter than (310.4d and 586.6d, respectively) found by Thiruvenkadan et al (2014) in Murrah buffaloes.…”

Section: Resultscontrasting

confidence: 69%

“…The direct heritability (h 2 a ) for FLMY, FLP, FLDM, AFC, FDO and FCI were moderate 0.25, 0.18, 0.24, Shalaby et al (2016), Madad et al (2013) for FLMY was 0.06 of Khuzestan buffaloes, Seno et al (2010) for FLMY and AFC were 0.20 and 0.07, respectively in Murrah buffaloes and Catillo et al (2001) for AFC was 0.26 in Murrah buffaloes. As a matter of fact, the estimated permanent environmental ration ranged from 0.11 to 0.38, close to the finding by El-Awady & Abu El-Naser (2017) for MY, LP, DO and CI in Friesian cows.…”

Section: Resultsmentioning

confidence: 92%

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Direct and Maternal Genetic Trends for Some Productive and Reproductive Traits in Egyptian Buffaloes

Naser

2020

JITV

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This study was done to determine the direct and maternal genetic and phenotypic trends for productive traits such as first lactation milk yield (FLMY, kg), first lactation period (FLP, d) and first lactation daily milk (FLDM, kg), and reproductive traits such as age at first calving (AFC, mo), First days open (FDO, d) and first calving interval (FCI, d). Data were collected over consecutive 25 years (1991 to 2015) of 1104 first lactation of 135 sires and 482 dams maintained at Mahallet Mousa farms of Animal Production Research Institute. Data were analyzed by Animal model to determine genetic parameters for studied traits. Means of FLMY, FLP, FLDM, AFC, FDO and FCI were 1546.5kg, 189d, 7.9kg, 37.9mo, 120.8d and 428d, respectively. The direct heritability (h2a) for same traits were 0.25, 0.18, 0.24, 0.45, 0.18 and 0.19, respectively. Corresponding maternal heritability (h2m) for mentioned traits was 0.12, 0.19, 0.22, 0.25, 0.12 and 0.12, respectively. Genetic correlations (rg) among studied traits were varied between -0.19 to 0.38. Accuracy of predicted breeding value varied between 69 to 94, 0.37 to 94 and 42 to 91% for FLMY, FLP, FLDM, AFC, FDO and FCI of sires, cows and dams, respectively that revealed the genetic improvement could be actualized through each of cows or sires or dams. Additive and maternal genetic, permanent environmental and phenotypic trends were not significant for all studied traits. It indicated that it is important to set up a plan to improve genetic and environmental conditions thus, increasing productivity and realization of high profitability.

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Section: Resultscontrasting

confidence: 69%

Section: Resultsmentioning

confidence: 92%

Direct and Maternal Genetic Trends for Some Productive and Reproductive Traits in Egyptian Buffaloes

Naser

2020

JITV

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“…The high genetic correlation between milk yield traits (FLSMY, FPY, and FLL) reported in this study implies that common genetic and physiological phenomenon affect the milk production trait. Also, a positive and high genetic correlation between the milk traits suggests the cumulative improvement of these traits, if used during selection [ 39 ].…”

Section: Discussionmentioning

confidence: 99%

“…Also, a positive and high genetic correlation between the milk traits suggests the cumulative improvement of these traits, if used during selection [39].…”

Section: A C C E P T E D a R T I C L Ementioning

confidence: 99%

Association between age at first calving, first lactation traits and lifetime productivity in Murrah buffaloes

et al. 2022

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Objective: This study was conducted to estimate the association of age at first calving with first lactation traits as well as lifetime performance traits in Murrah buffaloes.Methods: Data on first lactation and life time performance of Murrah buffaloes (n=679), maintained at ICAR-CIRB, Hisar, India during the period 1983 to 2017, were deduced to calculate heritability estimates, genetic and phenotypic correlation of different first lactation and lifetime traits. The univariate animal model was fitted to estimate variance components and heritability separately for each trait, while bivariate animal models were set to estimate genetic and phenotypic correlations between traits under study.Results: The heritability was high for First Peak Milk Yield (FPY, 0.64±0.08), moderate for Age at First Calving (AFC, 0.48±0.07) and breeding efficiency (BE 0.39±0.09). High genetic correlations of FLTMY (First Lactation Total Milk Yield) with FLSMY (First Lactation Standard (305 days or less) Milk Yield), FPY (First Peak Milk Yield) and FLL (First Lactation Length) was seen. Likewise, genetic correlation of AFC was positive with traits viz. FLTMY, FLL, FDP (First Dry Period), FSP (First Service Period), FCI (First Calving Interval), HL (Herd Life) and PD (Productive Days). Significant phenotypic correlation of FLTMY was observed with traits viz. HL (Herd Life), PL (Productive Life), PD, Total LTMY (Total Lifetime Milk Yield), Standard LTMY (Standard Lifetime Milk Yield). Moreover, positive genetic and phenotypic correlation of FPY was observed with HL, PL, PD, Total LTMY and Standard LTMY.Conclusion: This study reports that age at first calving had positive genetic correlation with FDP, FSP, FCI and UD (Unproductive Days) while, negative association of AFC was observed with FLSMY, PL, Total LTMY, Standard LTMY and BE. This suggests that reduction of age at first calving would results in improvement of lifetime performance traits.

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“…Therefore, it is crucial to apply these models in a genetic evaluation program for milking buffalo in Iran. Madad et al (2013a) estimated the genetic parameters for milk and fat yields in Khuzestan buffalo of Iran with the multivariate restricted maximum-likelihood (REML) procedure; however, there are no estimates of genetic parameters for test-day milk yield in Khuzestan buffalo using RRM.…”

Section: Introductionmentioning

confidence: 99%

Estimation of genetic parameters for test-day milk yield in Khuzestan buffalo

Madad

Hossein-Zadeh

Shadparvar

2016

Pesq. agropec. bras.

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The objective of this work was to estimate covariance functions for additive genetic and permanent environmental effects, as well as to obtain genetic parameters for buffalo test-day milk yield using random regression models on Legendre polynomials (LPs). A total of 2,538 test-day milk yield (TDMY) records from 516 first lactation records of Khuzestan buffalo, calving from 1993 to 2009 and belonging to 150 herds located in the state of Khuzestan, Iran, were analyzed. The residual variances were modeled through a step function with 1, 5, 6, 9, and 19 classes. The additive genetic and permanent environmental random effects were modeled by LPs of days in milk using quadratic to septic polynomial functions. The model with additive genetic and animal permanent environmental effects adjusted by cubic and third order LP, respectively, and with the residual variance modeled through a step function with nine classes was the most adequate one to describe the covariance structure. The model with the highest significant log-likelihood ratio test (LRT) and with the lowest Akaike information criterion (AIC) and Bayesian information criterion (BIC) was considered to be the most appropriate one. Unexpected negative genetic correlation estimates were obtained between TDMY records of the twenty-fifth and thirty-seventh week (-0.03). Genetic correlation estimates were generally higher, close to unity, between adjacent weeks during the middle of lactation. Random regression models can be used for routine genetic evaluation of milk yield in Khuzestan buffalo.

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Genetic and phenotypic parameters for productive traits in the first three lactations of Khuzestan buffaloes in Iran

Cited by 7 publications

References 18 publications

Direct and Maternal Genetic Trends for Some Productive and Reproductive Traits in Egyptian Buffaloes

Direct and Maternal Genetic Trends for Some Productive and Reproductive Traits in Egyptian Buffaloes

Association between age at first calving, first lactation traits and lifetime productivity in Murrah buffaloes

Estimation of genetic parameters for test-day milk yield in Khuzestan buffalo

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