Age Correction Factors for Some Productive Traits in a Commercial Herd of Holstein Friesian Cattle in Egypt

Atil, Hlya; ., M. Nagib El Ariain; Khattab, A. S.

doi:10.3923/jbs.2001.663.665

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Season of calving was highly significant effect on 305d-MY cows which calved in autumn had higher TMY (7494.27 kg) than those that calved in other seasons. Significant effect season of calving was observed by Atil et al, 2001;M'hamdi et al, 2012 andRatwan et al, 2016 of ( HF cattle, Tunisian Holstein and Jersey crossbred cattle, respectively). Katok and Yanar, (2012) and Poonam et al, (2016) also reported significant (P<0.05) effect of season of calving on 305d-MY.…”

Section: Resultsmentioning

confidence: 94%

Genetic Evaluation for Milk Production Traits A Herd of Friesian Cattle Raised in Egypt التقییم الوراثی لصفات إنتاج اللبن فی قطیع من أبقار الفریزیان المرباه فی مصر

El-den

Sanad²,

Refaey

2020

Journal of Animal and Poultry Production

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This study armed to estimate of non-genetic and genetic parameters that affecting Study traits including lactation length (LL), total milk yield (TMY), and 305 day milk yield (305d-MY). The number of records used were 1630 lactation records over a period of 10 years of pure Friesian cows raised at the commercial station in northern Egypt. Analysis was performed using SAS (To estimate non-genetic factors ) In addition to the animal model (estimate genetic parameters). The most important results of the study that have been reached are summarized as follows: All non-genetic factors were significant for all the study traits. The overall mean for (LL), (TMY) and (305d-MY) was 358.3 days; 8675.3 and 7387.7 kg, respectively. Heritability values for were 0.13 ± 0.027, 0.28 ± 0.031, and 0.35 ± 0.030 for trait) f (LL), (TMY), and 305d-MY) respectively. Present results recommended the productive performance of Friesian cows can be improved through the adoption of appropriate management, nutrition, and breeding programs achieved through the selection program.

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Section: Resultsmentioning

confidence: 94%

Genetic Evaluation for Milk Production Traits A Herd of Friesian Cattle Raised in Egypt التقییم الوراثی لصفات إنتاج اللبن فی قطیع من أبقار الفریزیان المرباه فی مصر

El-den

Sanad²,

Refaey

2020

Journal of Animal and Poultry Production

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Milk production of Jersey and Fleckvieh × Jersey cows in a pasture-based feeding system

Goni

Muller²,

Dube

et al. 2014

Trop Anim Health Prod

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Milk production parameters of purebred Jersey (J) cows and Fleckvieh × Jersey (F × J) cows in a pasture-based feeding system were compared using standard milk recording procedures. Milk, fat and protein production was adjusted to 305 days per lactation and corrected for age at calving. Effects of breed, parity, month and year were estimated for milk, fat and protein yield as well as fat and protein percentage, using the general linear model procedure. Fixed effects identified as affecting milk production parameters significantly were breed, parity and year. F × J cows produced significantly more milk than J cows (6141 ± 102 and 5398 ± 95 kg milk, respectively). Similarly, fat and protein yields were significantly higher in F × J (272 ± 4 and 201 ± 3 kg, respectively) than in Jersey cows (246 ± 3 and 194 ± 2 kg, respectively). Fat and protein percentages only differed slightly in absolute terms being 4.61 ± 0.04% fat in the Jersey compared to 4.47 ± 0.04% fat in the F × J. Protein levels for J and F × J cows were 3.62 ± 0.03 and 3.51 ± 0.03%, respectively. Despite a lower fat percentage, F × J crossbred cows may be more productive than purebred Jersey cows which may be due to heterotic effects.

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Age Correction Factors for Some Productive Traits in a Commercial Herd of Holstein Friesian Cattle in Egypt

Cited by 2 publications

References 15 publications

Genetic Evaluation for Milk Production Traits A Herd of Friesian Cattle Raised in Egypt التقییم الوراثی لصفات إنتاج اللبن فی قطیع من أبقار الفریزیان المرباه فی مصر

Genetic Evaluation for Milk Production Traits A Herd of Friesian Cattle Raised in Egypt التقییم الوراثی لصفات إنتاج اللبن فی قطیع من أبقار الفریزیان المرباه فی مصر

Milk production of Jersey and Fleckvieh × Jersey cows in a pasture-based feeding system

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