A comparison of different methods of estimating sire transmitting ability of some milk traits in a herd of Holstein Friesian cattle

Atil, Hülya; Khattab, A. S.

doi:10.5194/aab-43-115-2000

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…During summer season, July to September, milk yield was decreased. This finding is in agreement with Mohammed, (1986), in Libya and Atil and Khattab (2000), in Egypt. However, the highest milk yield was found during April and November Fig 1. In April, the increase in milk yields may due to the availability of green pasture during spring season.…”

Section: Discussionsupporting

confidence: 93%

“…This indicates, Holstein Friesian heifer matured earlier under Libyan environment (27 months), compared to 30 months for the imported German heifer. This is in agreement with Atil and Khattab, (2000) for German Holstein Friesian under Egyptian environment. This is also, expected due to differences in management and environment between Germany and Libya.…”

Section: Discussionsupporting

confidence: 91%

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Performance of Holstein Friesian Cattle Under Stressful Conditions at Goht Al-Sultan Farm, Libya

Gargoum

Bozrayda

Elamrony

et al. 2009

Journal of Animal and Poultry Production

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In the present study, the productive and reproductive performance of German Holstein Friesian dairy cows and subsequent generations born in Libya were evaluated. The number of cows that had the first lactation record included in the study was 2094. Data were analyzed using REML to estimate factors affecting milk yield and reproductive traits. The model included: month, year of calving, management, generation, origin of sire as fixed effects and sire as random effect. In addition, age at first calving and lactation period included for milk yield traits as a covariate. Total milk yield was generally high (8409 Liters) and achieved with reproductive efficiency (110 days open) during Dutch management, and at the expense of the reproductive traits (161 days open) during Libyan Management. Management, calving year, calving month, age at first calving and lactation period had a significant effect on both milk yield and reproductive traits. In addition, milk yield and days open were affected by the Temperature Humidity Index (THI). A different trend of milk yield and days open was found during cold and hot seasons. However, Days open were more affected by the increased THI than high milk yield. Management plays important role to maintain high productivity with reproductive efficiency under heat stress conditions. .

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 91%

Performance of Holstein Friesian Cattle Under Stressful Conditions at Goht Al-Sultan Farm, Libya

Gargoum

Bozrayda

Elamrony

et al. 2009

Journal of Animal and Poultry Production

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Variances of direct and maternal genetic effects for milk yield and age at first calving in a herd of Friesian cattle in Egypt

2005

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A total of 2095 lactation records of Holstein Friesian cattle kept at Dalla Farm in Egypt during the period from 1988 to 1992 were used in this study. Those data were used to estimate variances from direct and maternal genetic effects. The data was analyzed by using Multiple Traits Derivative Free Restricted Maximum Likelihood (MTDFREML) according to BOLDMAN et al. (1995) using repeatability Animal Model. Two models were used: Model 1 includes month of calving, year of calving, parity as fixed effects, days open and days dry as covariates and direct genetic, maternal genetic, covariance between direct and maternal genetic, permanent environmental and residual as random effects; Model 2 is similar to Model 1, but excluding additive maternal and covariance between additive direct and maternal effects. Estimates of heritability for 305 day milk yield (305 dMY) were 0.22 and 0.23, for Model 1 and Model 2, respectively. Heritability estimates for age at first calving (AFC) were 0.77 and 0.82 for Model 1 and model 2, respectively. The removal of additive maternal genetic effects and covariance between direct and maternal genetic effects from the model increased estimates for heritability of additive genetic effects by 0.01 and 0.05 for 305 dMY and AFC, respectively. Then, the additive maternal genetic effect and covariance between direct and maternal genetic effects do not seem to make important contributions to the phenotypic variance for milk yield and age at first calving, and these effects are probably not important for genetic evaluations.

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

et al. 2007

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Abstract. The data obtained from the dairy herd of the Arab Company for Agricultural Production and Processing (ACAPP) in a semi arid area 40 km south of Khartoum involved 337 cows with a total of 1049 records from 16 years between 1986 and 2002. The least squares means for age at first calving, calving interval, days open, lactation milk yield, daily milk yield, lactation length and dry period were 29.76±0.40 months, 433.12 ± 6.70 days, 167.79±7.08 days, 3475.53±78.89 kg, 12.29±0.28 kg, 294.10±3.62 days and 164.08 ± 6.70 days, respectively. The analysis of variance showed that the parity number had significant (p<0.05) influences on all studied traits, while year-season of calving influenced (p<0.05) age at first calving, milk yield per lactation and daily milk yield. The sire of cow influenced (p<0.05) lactation yield, daily yield, lactation length and days open. The effects of linear and quadratic regressions of both lactation yield and daily yield on length of lactation were also highly significant (p<0.01). Heritability estimates of age at first calving, calving interval, milk yield per lactation, daily milk yield, lactation length and dry period were generally low (0.098±0.104, 0.047±0.046, 0.130±0.042, 0.123±0.041, 0.172±0.062 and 0.044±0.031, respectively) except the heritability of days open which was 0.51±0.37. The productivity of the herd in this study which averaged 12.3 kg/cow/day was much lower than the expected productivity of Holstein Friesian cows, which reflects the negative impact of the prevalent environment in the Sudan. More records and economic data are required to examine the economic feasibility of raising pure Friesians under Sudan conditions.

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A comparison of different methods of estimating sire transmitting ability of some milk traits in a herd of Holstein Friesian cattle

Cited by 4 publications

References 6 publications

Performance of Holstein Friesian Cattle Under Stressful Conditions at Goht Al-Sultan Farm, Libya

Performance of Holstein Friesian Cattle Under Stressful Conditions at Goht Al-Sultan Farm, Libya

Variances of direct and maternal genetic effects for milk yield and age at first calving in a herd of Friesian cattle in Egypt

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

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