1995, Cilt 11, Sayı 2, Sayfa(lar) 013-021
The Effects of Long Term Growth Hormone Administration on Milk Yield, Milk Composition And Reproductive Performance Of Dairy Cows
Behiç Coşkun1, Erdoğan Şeker1, Erol Alaçam2, Behiç Serpek3, Suzan Yalçın4, Şakir D. Tuncer5
1S.Ü. Veteriner Fak. Hayvan Besleme ve Beslenme Hastalıkları Ana Bilim Dalı, KONYA
2A.Ü. Veteriner Fak. Doğum ve Reprodüksiyon Ana Bilim Dalı, ANKARA
3S.Ü. Veteriner Fak. Biyokimya Anabilim Dalı, KONYA
4S.Ü. Veteriner Fak. Besin Hijyeni ve Teknolojisi Ana Bilim Dalı, KONYA
5A.Ü. Veteriner Fak. Hayvan Besleme ve Beslenme Hastalıkları, ANKARA
Keywords: Dairy cows, bovine somatoüophine, milk yield, miik composition, reproductive performance
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In this study, 14 Holstein heifers were used. Animals were divided into two groups. Ftekombinant bovine somatotropin (rBST) was injekted 14 mg/day daily one of the groups during 196 days. The effects of rBST on milk yield, milk composition, feed intake, some postpartal reproductive parameters, blood glukoz, insuline and non es-terifed fatty acids levels were investigated. During ten weeks at the pretreatment, milk yield was measured and these values were used in covarians analysis. Milk yield was significantly increased by the rBST treatment. Before the rBST administration average milk yield of control and treatment group were 15.33 kg and 14.04 kg respectively. These datas were became equal in the first month of the experiment and were observed as 13,76 kg for the control group, 13.52 kg for the treatment group. Then milk yield was more at the rBST administred group than the control group during the last months of the experiment. Concentrate feed was gi ven to animals relative to their milk yield and chopped alfalfa hay was given ad libitum. There were no differences between groups for the alfaifa hay intake. No negative effects of rBST treatment were observed on early pospartum sign and ovarial functions. Milk composition, blood in* silune, glucose and non esterified fatty acids levels were not affected by the hormone administration.