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| Articles
by
Bahri Bayram |
Total Records (
4 ) for
Bahri Bayram |
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Olcay Guler
,
Mete Yanar
,
Recep Aydin
,
Bahri Bayram
,
Unsal Dogru
and
Sinan Kopuzlu
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The research was performed to determine the effect of non-genetic factors on milkability characteristics and to estimate genetic parameters and relationships among Milk Flow Rate (MFR), Milking Time (MT) and milk yields of Holstein Friesian cows reared in Eastern Region of Turkey. The data used in this study consisted of 1267 observations of MT and MFR on 177 lactations of 91 Holstein Friesian cows. The least squares means for MFR, MT and Total Test Day Milk Yield (TTDMY) were 1.049 kg min-1, 5.83 min and 12.31 kg, respectively. Parity, stage of lactation and calving season affected (p<0.01) on the MFR, MT and TTDMY. Multiparous cows had higher MT and TTDMY (p<0.01) than primiparous cows. Calving season affected (p<0.01) on MT, MFR and TTDMY. The heritability coefficients for MFR, MT and TTDMY were 0.21, 0.23 and 0.23, respectively. The positive genetic correlations of MFR with TTDMY, actual milk yield and 305 days milk yield were 0.62, 0.49 and 0.48, respectively, while genetic correlations between MT and TTDMY, actual milk yield and 305 days milk yield were 0.20, 0.28, 0.34, respectively. Phenotypic and genetic correlations between MFR and MT were -0.49 and -0.63, respectively. |
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Vecihi Aksakal
and
Bahri Bayram
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The aim of this study, was to estimate genetic and phenotypic parameters for birth weight and to determine the survival rate of calves of Holstein Friesian cattle reared organically. Aborting rate, still born rate and the calving difficulty rate were 4.6, 3.9 and 9.1%, respectively. The average birth weight was 42.76±0.229 kg in present study. This value was quite higher than the birth weight in Holstein Friesian calves that breed conventionally in Turkey’s conditions. The effect of calving season (p<0.01) and farming system (p<0.05) on birth weight were significant. Male calves had 2.69 kg higher birth weight than females and this difference was found significant (p<0.01). The mean birth weight of single calves was 6.26 kg (17%) higher than that of twin calves. The effect of the years on birth weight was not significant, because caring, feeding and the other breeding methods were made according to the conditions of the regulations. As the birth parity was increased, the birth weight decreased (p<0.05). Heritability and repeatability estimates belong to birth weight were found as 0.232±0.110 and 0.206±0.073, respectively. |
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Olcay Guler
,
Mete Yanar
,
Bahri Bayram
and
Jale Metin
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The effects of three levels of milk replacer on growth performance of Brown Swiss calves (15 males
and 15 females) were investigated in the study. The amount of daily milk replacer given to calves in the
treatment groups was kept constant at 6, 7 and 8% of their birth weight. The calves were weaned at 35 days of
age. The weaning weight, 4 and 6 months weights were, respectively 42.0±1.2, 93.5±4.3 and 142.0±6.3 kg for
calves in 6% group, 42.6±1.2, 96.4±4.2 and 146.8±6.3 kg for those in 7% group and 45.4±1.2, 89.6±4.2 and
133.9±6.3 kg for young animals in 8% group. The weights were not significantly affected by the levels of the
milk replacer. Levels of the milk replacer feeding did not affected significantly on the daily weight gains and
gains in the body measurements in the pre- and post-weaning periods of the growth. Overall results of the
study suggested that it could be possible to drop the level of milk replacer from 8 to 6% of birth weight without
causing a detrimental influence on the growth characteristics of Brown Swiss calves.
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Bahri Bayram
,
Mete Yanar
and
Omer Akbulut
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The study was aimed to describe changes caused by conversion to organic dairy farming in Turkey, focusing on reproductive and milk production traits. The data used in this research were obtained from reproductive and milk records of Holstein Friesian cows reared in a private organic dairy farm. The results revealed that cows under organic management had shorter days open and calving interval values compared with cows reared under pre-organic system. Actual and 305 days milk yields of cattle in organic system were greater than these of cows in pre-organic system. Lactation duration was also significantly influenced by farming system and calving season, but days dry was not affected by none the non-genetic factors. |
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