Milk yield and reproductive performance of Friesian cows under Sudan tropical conditions

Gader, A. z. Abdel; Ahmed, M. K. A.; Musa, L. M.-A.; Peters, KJ

doi:10.5194/aab-50-155-2007

Cited by 32 publications

(19 citation statements)

References 15 publications

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“…Table (3) display the effects of parity, season and year of calving on TMY, 305d-MY LP, NSC and AFC. Mean of TMY for autumn and spring had longer than compared summery (table 3) this results agreement Usman et al (2011) and Abdel-Gader et al, (2007). Averages of 305d-MY were higher for cows calved in winter and autumn than in spring and summer.…”

Section: Resultssupporting

confidence: 88%

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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Section: Resultssupporting

confidence: 88%

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 heritability estimate of CI was very low (0.03). Similar estimates were reported previously [27,33]. However, higher estimates were published by Islam et al [37].…”

Section: Heritability Estimatessupporting

confidence: 92%

“…High heritability estimates for fat and protein yields (0.37 and 0.32, respectively), which are consistent with those obtained by Mashhadi et al [29], but are higher than those recorded by others [30,31]. Days in milk had a medium heritability estimate (0.11), which was similar to those reported previously [32,33]. On the other hand, these estimates were much higher than those reported by Ayied et al [25], but were lower than those recorded by others [5,34].…”

Section: Heritability Estimatessupporting

confidence: 90%

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Genetic Parameters, Breeding Values and Genetic Trends for Some Productive and Reproductive Traits of Holstein Cows in Egypt

Abdel-Hamid

El-Bayoumi

Sherief

2019

Zagazig Veterinary Journal

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This study aimed to estimate the genetic parameters (heritability and genetic correlation), breeding value and genetic trends for some productive and reproductive traits of Holstein Friesian cows in Egypt with animal model statistical method. A total of 3400 lactation records collected from 1060 cow's progeny of 99 sires and 691 dams through the period from 1998 to 2010 were used in this study. Results of genetic correlations showed great variability from very high positive to very low negative values. High heritability estimates were recorded for all studied traits with the exception of days in milk, calving interval and days open which revealed low estimates. The ranges of cows breeding values have been found to be higher than either sires or dams for all studied traits. Genetic trends were positive for 305-day milk yield (2.68 kg), age at first calving (0.020), fat yield (0.031kg), fat% (0.001%) and protein % (0.002%), but were negative for protein yield (-0.098 kg) and days open (-0.219). In conclusion, higher range of the cow breeding values than either sires or dams revealed a wider genetic variation and a good opportunity for selecting the superior cows. Positive genetic trends for 305-day milk yield, age at first calving, fat%, fat yield and protein% indicated that there was a genetic improvement in these traits in desirable direction, but negative genetic trends for days open and protein yield indicating a decrease in mean breeding value for these traits over the study period.

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“…However, such detected adverse or undesirable environmental effect during autumn and winter (positive environmental effect) may be due to the lack of green fodders. (Abdel-Gader et al 2007) found that milk production was higher in winter. While he was higher in the spring and autumn seasons and less in the summer due to the weather is hot (Javed et al2004).…”

Section: Fig 2 Env Of Reproductive Traits As Regressed Against Yearmentioning

confidence: 99%

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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Milk yield and reproductive performance of Friesian cows under Sudan tropical conditions

Cited by 32 publications

References 15 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

Genetic Parameters, Breeding Values and Genetic Trends for Some Productive and Reproductive Traits of Holstein Cows in Egypt

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

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