Genetic Improvement Using the Selection Indices for Some Productive and Reproductive Traits in Friesian Cattle Raised in Egypt

Sanad, Safaa S.

doi:10.21608/jappmu.2016.48807

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…The results lead to important effective role of sire in improving milk production traits. Similar results were obtained by Amr (2013) and Sanad (2016).…”

Section: Resultssupporting

confidence: 90%

Genetic Evaluation for Some Productive and Reproductive Traits in Friesian Cows Raised in Egypt

Sanad¹,

Hassanane

2017

Journal of Animal and Poultry Production

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The objective of this study was to estimate the genetic parameters (heritability, and breeding values) as well as the effect of non-genetic factors such as (abdominal arrangement, season and year of calving also interactions between these factors) for some productive and reproductive traits. From the studied traits: total milk yield (TMY, kg), 305 day milk yield (305d-MY, kg), Lactation period (LP, day) as milk production traits, number of services per conception (NSC, services) and age at first calving (AFC, month) as reproductive traits. A total number of 1876 lactation records of 586 cows (daughters of 374 dams and 58 sires) in Sakha herd, during the period from 2001 to 2015 in dairy Friesian herd in farm Egypt. The analysis was performed using SAS (2003). The model included the random effects of genetic factors (sire effect) and fixed effects (parity, season and year of calving). In addition Single-trait animal models were used to estimate genetic parameters; Animal model was used to estimate heritability and breeding value. 1-Actual means of TMY, 305d-MY, LP, NSC and AFC were 4038.56kg ; 3734.8 kg; 317.8 day; 1.93 and 32.5 month respectively. 2-Heritability (h 2) estimated of TMY, 305d-MY, LP, NSC and AFC were 0.17, 0.25, 0.17, 0.06 and 0.36 respectively. 3-Rank correlation (were computed between predicted breeding values) among TMY, 305d-MY LP, NSC and AFC were highly significant effect, the ranged from-0.17 to 0.59 in production traits. 4-Regression coefficients of estimated breeding values of cow on time were negative and no significant for all studied traits 5-The range of breeding value (BV) for cows was high for most of studied traits. The ranges of breeding values of cows for TMY, 305d-MY, LP, NSC and AFC were 2823, 1744, 2848, 0.754 and 7.68 respectively. In conclusion, The difficulty of genetic improvement of NSC by selection due to the low heritability of this trait but can be improved by increasing good care and improving environmental conditions together. Higher ranges of BV for cows for most of studied traits indicate higher genetic variation and higher opportunity for selection of top cows in breeding value, which would result in rapid genetic progress in the future generations. The study recommends that this be confirmed by molecular genetics to detect the location of quantitative traits that affect milk production and selection of the cows carrying these genes.

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“…The results lead to important effective role of sire in improving milk production traits. Similar results were obtained by Amr (2013) and Sanad (2016).…”

Section: Resultssupporting

confidence: 90%

Genetic Evaluation for Some Productive and Reproductive Traits in Friesian Cows Raised in Egypt

Sanad¹,

Hassanane

2017

Journal of Animal and Poultry Production

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“…While (h 2 m ) were 0.03, 0.07, 0.05, 0.01 and 0.002 respectively. In this results agreement with those reported by Awad and Afifi (2003), (El-Bayoumi 2015) and (Sanad 2016).Differences in h 2 a estimates among various studies for the same traits of the same breed may be due to differences in the number of records used.…”

Section: Resultssupporting

confidence: 92%

“…While genetic correlation among milk traits studied were in most cases negative and small. Similar results are reported by (Mostafa et al 2013) and (Sanad 2016).…”

Section: Genetic and Phenotypic Correlationsupporting

confidence: 92%

“…While it was higher than those reported by (Awad and Afifi (2003) 2680 kg. The present estimate of 305-day MY was nearest to estimates observed by Ezz El-Arab 2012and (Sanad 2016) on Friesian cows in Egypt. Mean of LP found in the present study is longer than reported by was lower than those obtained by Awad and Afifi (2003) ,Ezz El-Arab (2012), Hammoud (2013) and Sanad (2016)on Friesian cattle raised in Egypt , ranging from 315 to 345 .While it was higher than those reported by (Hussein 2000).…”

Section: Resultssupporting

confidence: 67%

“…Table.4. (Sanad 2016) found that positive genetic associations were estimated between TMY and LP(0.22). While genetic correlation among milk traits studied were in most cases negative and small.…”

Section: Genetic and Phenotypic Correlationmentioning

confidence: 99%

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Epigenetics TREND for some Productive and Reproductive Traits of Friesian Cattle Raised in Egypt

Sanad¹,

Gharib²

2017

Journal of Animal and Poultry Production

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The objectives of this study were to estimate the genetic parameters and Epigenetics TREND (EP) of milk traits of herd of Friesian in Egypt. The studied traits were 305 day milk yield (305d-MY, kg),total milk yield (TMY, kg), Lactation period (LP, day), days open (DO) and number of services per conception (NSC, services).The data included 1794 records of 704 cows daughters of 86 bulls and 439 damduring the years 2007to 2016 were collected from Alkarda farm (Government farm) located in Kafr El-Sheikh, Egypt. Single-Trait animal model was used to estimate genetic parameter; overall means of 305-dayMY, TMY, LP, DO and NCS were 2935Kg, 3320 Kg , 310 day, 151 day and 1.7 services, respectively, Additive heritability (h a) estimated for 305d-MY, TMY, LP DO and NSC were 0.34, 0.31, 0.29, 0.06 and 0.26,respectively. While maternal heritability (h m) were 0.03, 0.07, 0.05, 0.01 and 0.002, respectively , The environmental impact of the permanent lower corresponding values were 0.0031, 0.0027, 0.0037, 0.0062 and 0.0038, respectively.Indicating that the effect of animals' genetic performance is affected by the surrounding environmental conditions where full care through the mother leads to improvement of the studied traits.The genetic and phenotypic correlations of most of the studied traits were highly significant (p <0.001) and ranged from-0.22 to 0.46for geneticcorrelationbetween traits whilephenotypic correlation ranged from-0.11 to 0.65.Genetic trends were positive for all studied traits except for days open and NSC. Range of breeding value (BV)for all studied traits of cows (

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Genetic evaluation of some reproductive traits of commercial Friesian cattle under Egyptian conditions

Refaey

El-den

Sanad

2022

Archives of Agriculture Sciences Journal

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This study was conducted to evaluate the effect of some of genetic and non-genetic parameters on the reproductive traits of Friesian cows. The data were obtained from a commercial farm (Gharbawy farm) located in El-Sharkia governorate, Egypt. A total of 1630 records of 465 pure Friesian cows covered the period from 1998 to 2007 were collected. The data values of reproductive traits which include; days open (DO), calving interval (CI) and dry period (DP) were measured. The actual means of DO, CI and DP were 140.47, 432.76 and 93.57days, respectively. Parity, year and season of calving had a significance effect (p≤0.01) on all studied traits. Estimates of direct heritability (h 2 ) for all studied traits were low, with equal h 2 a values (0.02) for both DO and DP, it was 0.04 for CI. Concerning maternal permanent environment, effects were low ranging from 0.0003 to 0.01. Moreover, error variance effects represent the largest proportion of the total variation ranging from 0.96 to 0.98. All coefficients were positive for phenotypic correlations and ranged from 0.388 to 0.746. Moreover, the coefficients of genetic correlations among all studied reproductive traits were positive and ranged from 0.230 to 0.492. Non-genetic factors have a strong influence on the herd under study, which requires the stability of technical and administrative processes to impr ove reproductive performance. Moreover, additional assessment studies required to improve the accuracy of information to increase productivity of such herds.

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Genetic Improvement Using the Selection Indices for Some Productive and Reproductive Traits in Friesian Cattle Raised in Egypt

Cited by 4 publications

References 2 publications

Genetic Evaluation for Some Productive and Reproductive Traits in Friesian Cows Raised in Egypt

Genetic Evaluation for Some Productive and Reproductive Traits in Friesian Cows Raised in Egypt

Epigenetics TREND for some Productive and Reproductive Traits of Friesian Cattle Raised in Egypt

Genetic evaluation of some reproductive traits of commercial Friesian cattle under Egyptian conditions

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