Yazarlar

• Akbulut, O.(1)
• Aksakal, Vecihi(1)
• Bayram, B.(1)
• Bayram, Bahri(1)
• Yanar, M.(1)
• Yanar, Mete(1)

• MakaleYalnız künye2010/r/gumushane/15617
  Non-genetic factors affecting milk and reproductive traits of Swedish Red and White cattle raised organically in Turkey

  Aksakal, Vecihi; Yanar, Mete; Bayram, Bahri

  The data on breeding and performance records of Swedish Red and White (SRW) cows kept in a private organic dairy farm in Kelkit, Turkey, during the period from 2006 through 2009 were used to study the effect of some non-genetic factors such as calving year, calving season, parity, age of dam and sex of calf on the various milk and reproductive traits. The actual lactation milk yield, daily milk yield, peak daily milk, days to attain milk yield and lactation length averaged as 5887.2±94.9 kg, 19.9±0.3 kg, 31.5±0.3 kg, 79.4±2.7 days and 302.5±3.2 days, respectively. The actual lactation milk yield, days to attain peak milk yield and lactation length were significantly affected by calving year and calving season. The effect of the parity on the daily milk yield, peak daily milk yield and days to attain peak milk yield were significant (P<0.01). The least squares means for calving interval and gestation length were 380.2±4.3 days and 275.4±0.6 days, respectively. Age of dam and calving season significantly (P<0.01) affected the days open. Mean age at first calving of SRW cows raised organically was 26.4±0.2 months and was significantly affected by the calving years. Significant (P<0.01) and positive phenotypic correlations of the actual lactation milk yield with daily milk yield (r = 0.71), peak milk yield (r = 0.53), lactation length (r = 0.53), days open (r = 0.43), calving interval (r = 0.36) and days attain to peak milk yield (r = 0.14) (P<0.05) were determined. In conclusion, the significant effects of environmental variables must be taken into consideration when developing and comparing models to be used in adjusting data to provide the best estimates of genetic values and parameters in evaluation of SRW cattle reared organically in Turkey.

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• MakaleYalnız künye2009/r/gumushane/15823
  The effect of average daily gain and age at first calving on reproductive and milk production traits of brown swiss and holstein friesian cattle

  Bayram, B.; Yanar, M.; Akbulut, O.

  The purpose of the study was to determine the effects of average daily gain and age at first calving on the reproductive and milk production traits of Brown Swiss (BS) a.d Holstein Friesian (HF) cattle. For this purpose, daily gains and ages at first calving were divided into two groups which were below the average called as the "slow" or "early" groups and above the average named as "moderate" or "late" groups respectively. BS heifers in the moderate group reached the first insemination age and first calving age 103.7 and 101.7 days earlier (P>0.01) than these in the slow group respectively. The corresponding values for HF heifers were 37.8 and 29.5 days respectively and were not significant. While the average daily gain had negative effects on reproduction traits following the first calving, the daily gain of BS had no effect on the milk production traits in all parities. HF heifers in the moderate group had higher (P>0.05) actual (585 kg) and 305 days milk yield (324 kg) in the second parity. Early calving in both breeds resulted in a significant (P>0.05) reduction in the actual and 305-days milk yield in the first parity. Early calving caused a significant decrease (P>0.05) in the actual milk yield, 305-days milk yield, actual milk fat and 305-days milk fat yield of BS cows in the first parity. Either early or late calving in BS didn't affect on milk traits in second and third parities. The early calving in HF lowered significantly (P>0.05) the actual and 305-days milk yield in first lactation. However, late calving in HF resulted in lower actual milk yield, 305-days milk yield, actual milk fat yield and 305-days milk fat yield in third parity.

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