&lt;b&gt;Genetic analysis of fertility traits of Holstein dairy cattle in warm and temperate climate

Rahbar, Rabie; Aminafshar, Mehdi; Abdullahpour, Rohullah; Chamani, Mohammad

doi:10.4025/actascianimsci.v38i3.31377

Cited by 17 publications

(23 citation statements)

References 32 publications

(54 reference statements)

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“…However, it is higher than the means reported for the same breed in other countries (Salem et al, (2006), Rahbar et al, (2016), Chawala et al, (2017) and Brzakova et al, (2019).…”

Section: Resultscontrasting

confidence: 60%

“…Studies conducted in Egypt reported a higher mean of LTMY of 26935kg, 21796kg and 18309kg, respectively by Abou-Bakr, 2009, Oudah et al, (2013) and Salem and Hammoud (2019), respectively. However, smaller means were 6970kg and 8831kg reported by Khattab et al, (2009) and Rahbar et al, (2016), respectively. In this study, the coefficient of variation (CV %) for productive traits (table 2) ranged from 37.05 to 68.74. and were 25.21 and 99.93 for fertility traits (CI and DO), respectively.…”

Section: Resultsmentioning

confidence: 63%

“…But, the highest the means were 4.04 lactation and 5.26 lactation they reported by Salem and Hammoud (2019) and Khattab and Atil (1999). The overall mean of DO was 78 d. Higher estimates were reported by several other authors from different production environments ranged from 124.26 to 255 reported by (Abou-Bakr et al, (2000), Abou-Bakr et al (2006), Faid-Allah (2015), Rahbar et al, (2016) and Brzakova et al,(2019).…”

Section: Resultsmentioning

confidence: 68%

“…On the other side, it is lower than heritability estimates of 0.38 for the Czech Holstein population by Brzakova et al, (2019). But, it is higher than heritability estimates of 0.02 in the north of Iran by Rahbar et al, (2016).…”

Section: Genetic Parameters: Heritability (H²a)mentioning

confidence: 65%

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Genetic Assessment for some Productive and Fertility Traits Using Maximum Likelihood (REML) Of Friesian Cows in Egypt

Ebrahim¹

2019

Journal of Animal and Poultry Production

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This study aimed to evaluate the genetic improvement program of the Friesian cows. SAS program was used to calculate averages and significant effect, and (REML) program was used to estimate genetic parameters for productive traits lifetime milk yield (LTMY), daily milk yield (DMY), Lactation Length (LL) and Lactation number complete (LNC), and fertility traits days open (DO) and calving interval (CI). The least square means of LTMY, DMY, LL, LNC, DO and CI were 17546 (Kg), 12(Kg), 304 (d), 3.5 (lactations), 78 (d) and 379(d), respectively. The effect of the month, year of calving and age at first calving (AFC) were significant for all the traits except, the farm was non-significant to DMY. Estimates of the heritability (h2a) were 0.09, 0.44, 0.24 and 0.34 for LTMY, DMY, LL and LNC, respectively, whereas 0.13 and 0.17 for DO and CI, respectively. High h2a of productivity traits, particularly DMY, emphasized the possibility of achieving a significant rate of genetic improvement in this trait through selection program. The genetic correlations were positive ranging from 0.02 to 0.76 , except CI with (DMY, LL and LNC) were negative and ranging from-0.07 to-0.76. The highest genetic and phenotypic correlation between DMY and LTMY. The low genetic value of these fertility traits reflected the lack of patients' genetic advancement for these traits while, phenotypic correlation estimates were positive except reproductive traits with some productive traits. Repeatability estimates are few and close to the heritability value due to the small presence of permanent environmental variation, confirming the unpredictability of the cow from its current records of fertility traits.

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“…However, it is higher than the means reported for the same breed in other countries (Salem et al, (2006), Rahbar et al, (2016), Chawala et al, (2017) and Brzakova et al, (2019).…”

Section: Resultscontrasting

confidence: 60%

Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 68%

Section: Genetic Parameters: Heritability (H²a)mentioning

confidence: 65%

See 2 more Smart Citations

Genetic Assessment for some Productive and Fertility Traits Using Maximum Likelihood (REML) Of Friesian Cows in Egypt

Ebrahim¹

2019

Journal of Animal and Poultry Production

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“…Javed, Abdullah, Akhtar, and Afzal () reported a similar correlation between calving interval and first lactation milk yield (0.46 ± 0.46) for Sahiwal cattle. Rahbar, Aminafshar, Abdullahpour, and Chamani () reported significant and positive correlation of calving interval with days open. The lower heritability estimate (14%) of calving interval suggested a relatively smaller contribution of genetic factors to this trait.…”

Section: Resultsmentioning

confidence: 98%

Heritability estimates and genetic correlations of various production and reproductive traits of different grades of dairy cattle reared under subtropical condition

Ali

Suhail

Shafiq

2019

Reprod Domestic Animals

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Inheritance of economic traits and their genetic correlation was studied in different breeds and their various grades (crossbred’s cattle) under the subtropical condition. Data on principal parameters comprising 10 years, that is 2004–2014, were utilized for the present study. Different grades of dairy cows comprising Holstein Friesian (HF), Sahiwal x Friesian (SxHF), Jersey (J), Jersey x Achai (JxAC) and Achai (AC) were included in the study. Heritability estimates and genetic correlations of some important productive and reproductive traits were worked out. Heritability estimates of certain economic traits were found to be: birthweight, 0.32 ± 0.181; age at maturity, 0.11 ± 0.136; age at first calving, 0.19 ± 0.162; days open, 0.09 ± 0.121; calving interval, 0.14 ± 0.211; dry period, 0.11 ± 0.124; lactation length, 0.04 ± 0.212 and lactation yield, 0.46 ± 0.206. Genetic correlation showed that body weight was significantly and positively correlated with lactation length (0.30) and lactation yield (0.81), while negatively correlated with age at maturity, age at first calving, days open, calving interval and dry period (−0.09, −0.07, −0.16, −0.34 and −0.002, respectively). Calving interval was positively and significantly correlated with the dry period (0.56), lactation length (0.72) and lactation yield (0.37). Moderate to higher heritability estimates with adequate genetic variance was found for body weight and lactation yield. The moderate to higher heritability estimates of birthweight in the present study revealed that this important trait might be considered in selection criteria.

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Moving towards sustainable breeding objectives and cow welfare in dairy production: a South African perspective

Erasmus

Marle-Köster

2021

Trop Anim Health Prod

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<b>Genetic analysis of fertility traits of Holstein dairy cattle in warm and temperate climate

Cited by 17 publications

References 32 publications

Genetic Assessment for some Productive and Fertility Traits Using Maximum Likelihood (REML) Of Friesian Cows in Egypt

Genetic Assessment for some Productive and Fertility Traits Using Maximum Likelihood (REML) Of Friesian Cows in Egypt

Heritability estimates and genetic correlations of various production and reproductive traits of different grades of dairy cattle reared under subtropical condition

Moving towards sustainable breeding objectives and cow welfare in dairy production: a South African perspective

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