Browsing by Author "Kul, Ertuğrul"

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Effects of lactation month and season on test-day milk yield and milk components in Holstein cows
(Agricultural Research Communication Centre, 2016-07-28) Gürcan, Eser Kemal; Çankaya, Soner; Kul, Ertuğrul; Abacı, Samet Hasan; Ülker, Mehmet; Çobanoğlu, Özden; Uludağ Üniversitesi/Veteriner Fakültesi/Genetik Anabilim Dalı.; 0000-0001-9633-634X; AAM-4544-2020; 9234694200
This study aims to determine the correlations between the test-day milk yield (TDMY) and the fat and protein content as well as the fat and protein yields in Holstein dairy cows and to investigate the effects of lactation period and sampling season on these parameters. The study material consists of 1.380 records of a total of 151 head of Holstein dairy cows raised on a private farm in Samsun province. In the study, the mean TDMY, fat content, protein content, fat yield and protein yield were recorded as 20.6 +/- 5.10 kg, 3.97 +/- 0.734%, 3.23 +/- 0.276%, 0.81 +/- 0.210 kg and 0.66 +/- 0.160 kg, respectively. The effects of lactation period and sampling season on the TDMY, fat content, protein content, fat yield and protein yield were found statistically significant (P<0.01). Statistically significant negative correlations were determined between the TDMY and the fat and protein content, but positive and statistically significant (P<0.01) correlations between the TDMY and the fat and protein yields. In conclusion, it might be stated that the effects of lactation period and sampling season should also be taken into account to improve milk yield and milk components.
Genetic Polymorphism of STAT1 and STAT5A Genes in Holstein, Jersey, and Indigenous Cattle Breeds in Turkey
(Kafkas Univ, Veteriner Fakultesi Dergisi, 2020-03-01) Kul, Ertuğrul; Abacı, Samet Hasan; Gürcan, Eser Kemal; Çankaya, Soner; Çobanoğlu, Özden; ÇOBANOĞLU, ÖZDEN; Bursa Uludağ Üniversitesi/Veteriner Fakültesi/Genetik Anabilim Dalı.; 0000-0001-9633-634X; AAM-4544-2020
This study aimed to determine genetic polymorphism in STAT1 and STAT5A genes for dairy cattle and some native cattle breeds in Turkey. 283 Jersey and a total of 472 Holstein cows from two different herds and 93 Grey Steppe, 85 Anatolian Black Cattle, and 66 East Anatolian Red cattle were used in this research. Generally, C allele gene frequency was higher than T allele for STAT1 in all breeds whereas C allele gene frequency was detected higher than G allele for STAT5A in Jersey and East Anatolian Red. On the other hand, G allele gene frequency was higher than C allele in Holstein, Grey Steppe, and Anatolian Black Cattle breeds. The expected deviations from the Hardy-Weinberg Equilibrium were significant only for Jersey breeds for STAT1 gene. Meanwhile, the expected deviation from equilibrium was also significantly different for Holstein in Black Sea Region (BSR), Anatolian Black Cattle and Grey Steppe for the STAT5A gene. FIS values were determined to STAT1 gene as negative for all breeds except for Holstein in Marmara Region (MR). Similarly, this value was determined to STAT5A gene as positive for all breeds except for Holstein in BSR. The genetic distances for two loci were calculated between 0.0029 and 0.1599 among all populations. Depending on the cluster analysis, Holstein in BSR and MR, Anatolian Black Cattle, East Anatolian Red were closely clustered to each other, while Grey Steppe and Jersey were located in completely different clusters. As a conclusion, based on the detected genetic diversity in STAT1 and STAT5A genes, it is possible to make a genetic improvement among bovine breeds raised in Turkey.
The influence of calving year on milk yield and milk components in dairy cattle
(Bursa Uludağ Üniversitesi, 2018-09-18) Kul, Ertuğrul; Çobanoğlu, Özden; Uludağ Üniversitesi/Veteriner Fakültesi.; 0000-0001-9633-634X
The aim of this study was to identify the effect of calving year on milk yield and milk composition traits in Holstein and Jersey cattle raised in the Marmara and Black Sea Regions of Turkey, respectively. The data set consisted of 582 dairy cows, which were 306 Holstein raised and 276 Jersey cows calving from 2011 to 2013. Except for fat yield, test day milk yield (TDMY), 305-day milk yield (305 DMY), fat percentage, protein percentage and protein yield of Jersey cows were affected by calving season. The effect of calving year on TDMY, 305 DMY, fat percentage, fat yield, protein percentage and protein yield of Holstein cows were found to be statically significant. In conclusion, in 2011 to 2013, milk yield and its composition in both Holstein and Jersey cows were significantly related to calving year.
Influence of some environmental factors on milk yield and milk components traits in jersey cows
(Parlar Scientific Publications (P S P), 2019-01-01) Kul, Ertuğrul; Gürcan, Eser Kemal; Çankaya, Soner; Abacı, Samet Hasan; Ülker, Mehmet; Çobanoğlu, Özden; ÇOBANOĞLU, ÖZDEN; Bursa Uludağ Üniversitesi/Veteriner Fakültesi; 0000-0001-9633-634X; AAM-4544-2020
This study was conducted to assess the effects of stage of lactation, parity and sampling season on milk yield and milk components in Jersey cows in Karakoy State Farm, Turkey. The data set consisted of 2657 milk records of 204 Jersey cows collected from September 2011 to December 2013. For this purpose, test day milk yield (TDMY) records and milk samples were taken once a month for 10-month period after parturition. The effect of stage of lactation, parity and sampling season on TDMY, fat percentage, protein percentage, fat yield and protein yield were found statistically significant (P<0.01). TDMY were correlated with fat percentage (-0.235) and protein percentage negatively (-0.254) but with fat yield (0.755) and protein yield positively (0.950) (P<0.01).In conclusion, these results suggest animal breeders that the effects of lactation stage, parity and sampling season may be taken into account in husbandry management to improve the milk yield and milk quality in Jersey cows.