Browsing by Author "Bakir, Galip"

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Estimates of Genetic Trends for 305-Days Milk Yield in Holstein Friesian Cattle
(Medwell online, 2009) Bakir, Galip; Kaygisiz, Ali; Cilek, Suleyman
The purpose of this study was to estimate the trends components of 305-days milk yield in Holstein Friesian Cattle Holstein cows raised at the Ceylanpinar state farm in Turkey between 1986 and 2007 years. The phenotypic, genetic and environmental trends for 305-days milk yield were found to be 106.91, 13.42 and 93.49 kg year(-1), respectively. Despite, there was a correct decision in selection environmental factors affected yield more. In this respect, continuing the improving environmental factors which is composed of maintenance, feeding, milking practices and barn is recommended.
Estimation of Genetic and Phenotypic Trends, Heritability and Repeatability for Some Milk Production Traits of Holsteins
(Kafkas Univ, veteriner Fakultesi dergisi, 2009) Bakir, Galip; Kaygisiz, Ali
The purpose of this study is to estimate the trend components and genetic parameters of 305-day milk yield and lactation length in Holstein Friesian Cattle. The phenotypic, genetic and environmental trends for 305 days milk yield and lactation length were found to be -23.59 kg/year and -0.486 days/year, 7.99 kg/year and -0.49 days/year, -31.58 kg/year and -0.976 day/year, respectively. The heritability and repeatability for 305 days milk yield and lactation length were 0.10, 0.11 and 0.27, 0.17, respectively.
Estimation of Variance Components and Genetic Parameters for Direct and Maternal Effects on Birth Weight in Brown Swiss Cattle
(Univ Agriculture, Fac veterinary Science, 2011) Kaygisiz, Ali; Bakir, Galip; Yilmaz, Isa; Vanli, Yusuf
The purpose of this study was to estimate the variance components and genetic parameters for birth weight in Brown Swiss cattle reared at Malya and Konuklar State Farms, Turkiye. The least square means of birth weight were 39.91 +/- 0.005 and 42.26 +/- 0.09kg for the calves raised at Malya and Konuklar State Farms, respectively. The effects of calving year, parity and calf sex on birth weight were significant (P<0.05). The effect of calving season on birth weight was highly significant (P<0.01) for Malya State Farm, while it was non-significant for Konuklar State Farm. Direct heritability (h(d)(2)), maternal heritability (h(m)(2)), total heritability (h(T)(2)) and the fraction of variance due to maternal permanent environmental effects (c(2)) were 0.09, 0.04, 0.11 and 0.04, respectively for birth weights of the calves raised at Malya State Farms. The corresponding values of birth weight for calves raised at Konuklar State Farm were 0.39, 0.015, 0.29 and 0.018, respectively. (C)2011 PVJ. All rights reserved
Evaluating the Relationship Between Mature Age Milk Yield and Several Traits Using Chaid Analysis in Brown Swiss Cows
(Medwell online, 2009) Bakir, Galip; Keskin, Siddik; Mirtagioglu, Hamit
Milk yield is important in breeding studies because it is one of the economically important traits. Therefore, determining the relationship between milk yield and some other traits could provide some important easiness in animal breeding studies. In this study, the aim was to evaluate the relationship between mature age milk yield and 9 independent variables (cow age, first mating age, lactation order, lactation period, dry period, first calving age, calving season, birth type and sex of calf) using CHAID analysis. Seven hundred and seventy Brown Swiss animals' records (from 1987-1997) taken from Mus State Production Farm (in Turkey) were utilized. CHAID analysis results showed that lactation period was primary, sex of calf and cow age were secondary and first mating age and dry period were the tertiary variables affecting mature age milk yield.
Milk Yield Traits of Brown Cows Reared at Malya State Farm and Effects of Some Environmental Factors on These Traits
(Kafkas Univ, veteriner Fakultesi dergisi, 2010) Cilek, Sueleyman; Bakir, Galip
This study was done to investigate some environmental factors (calving year, calving season and calving age) affecting milk yield traits and milk yield traits of Brown cows raised at the Malya state farm. The least square means of lactation duration, lactation milk yield, 305-day milk yield and dry period were estimated as 312.02 +/- 0.98 days, 5811.28 +/- 26.31kg, 5525.92 +/- 22.35 kg and 76.82 +/- 0.63 days, respectively. Effects of all environmental factors on lactation milk yield (actual milk yield) and 305-day milk yield were found statistically significant (P<0.001). Similarly, effects of calving season, calving year and calving age on lactation duration were found statistically significant (P<0.001-P<0.05). Effects of calving year, and calving age on dry period were statistically significant (P<0.001). According to result in this study, it can be said that Brown cattle are raised successfully at Malya state farm in region under steppe climate conditions of Turkish and yield levels of Brown cows were very good.
Milk Yield Traits of Holstein Cattle Reared at Tahirova State Farm in Balikesir Province in Turkey
(Medwell online, 2009) Bakir, Galip; Kaygisiz, Ali; Cilek, Sueleyman
In this study, effects of environmental factors on milk yield and milk yield characteristics of Holstein cows raised at Tahirova state farm in Balikesir province of Turkey have been investigated. A total of 1302 milk records obtained between 2000 and 2007 were used in this study. As milk yield traits, lactation duration, lactation milk yield, 305 days milk yield and dry period were investigated. Effect of environmental factors on milk yield traits was analyzed by using the least square means method. The least square means for the lactation duration, lactation milk yield, 305 days milk and dry period yield were 331.74 +/- 1.55 days, 7574.39 +/- 55.22 kg, 6810.14 +/- 56.38 kg and 79.47 +/- 0.90 days, respectively. The effects of calving year on lactation duration, lactation milk yield, 305 days milk yield and dry period were much significant (p<0.01). Effect of calving season on lactation duration was significant (p<0.05). Effect calving age on lactation duration and lactation milk yield was significant (p<0.05, p<0.01). The effects parity on lactation duration, lactation milk yield, 305 days milk yield and dry period were significant (p<0.01-0.05). It can be said that Holstein cattle have quite well milk yield and are raised successfully on Tahirova state farm and under conditions of west Anatolia in Turkey. To obtain much higher milk yield in this farm, true selection for milk yield should be done and better feeding, care and management should be done.
A Research on Reproductive Traits of Holstein Cattle Reared at Tahirova State Farm in Balikesir Province in Turkey
(Medwell online, 2009) Bakir, Galip; Cilek, Suleyman
The aim of this study was to investigate environmental factors affecting reproductive traits of Holstein cows and heifers raised at the Tahirova state farm in province Balikesir in Turkey. Reproductive traits were investigated by using 1074 records between 2000 and 2008. The least square means of age of first breeding, age of first calving, service period, calving interval and gestation length were 523.90 +/- 6.71, 815.38 +/- 7.18, 387.69 +/- 1.60, 122.30 +/- 1.67 and 277.45 +/- 0.27 days, respectively. Effects of calving year, calving age, calving season on age of first breeding and age of first calving were statistically significant (p<0.01). The effects of calving age, calving year and calving season on calving interval were significant (p<0.01-0.05). Although, the effect of calving year on service period was non-significant (p>0.05), the effects of calving age and calving season on service period were significant (p<0.01-0.05). Effects of sex of calf, calving age, calving year and calving season on gestation length were statistically significant (p<0.01-0.05). According to these results, it can be concluded that reproductive performance of Holstein cattle reared at this farm in Balikesir province were raised more successful than state farms in other regions of Turkey. To obtain better reproductive performance, service period should be decreased, heifers should be bred at 15 months of age, oestrus detection and artificial insemination should be done at the right time and convenient manner, GnRH injections was done for cows with high milk yield.