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Insulin-like growth factor I (IGF-1) influences gonadotrophin-releasing hormone (GnRH) neurons during puberty, and plays an important role in muscle growth in farm animals. The objective of this study was to estimate the genotype frequencies of the polymorphisms of IGF-1 and to determine associations between these polymorphisms and growth traits in Chinese Qinchuan cattle breeds. Five single nucleotide polymorphisms (SNPs), including one in intron 2 (g.5172T>G) and four in intron 3 (g.56495C>A, g.56501C>T, g.56801C>T and g.71090T>G) were identified according to the sequencing results of 487 individual of a Qinchuan cattle population. The chi-square test showed g.5172T>G, g.56495C>A and g.56801C>T were in Hardy-Weinberg equilibrium in all the samples. Six different haplotypes were identified, of which two major haplotypes had a frequency of 48.2% (-TCTTT-) and 16.3% (-TCCTT-). The single marker association analysis showed that the three polymorphisms (g.5172T>G, g.56501C>T and g.71090T>G) were significantly associated with growth traits (at P<0.01 or P<0.05). In conclusion, our results suggest that some polymorphisms in IGF-1 may play a role in determining one of the important genetic factors that influence growth traits in Chinese Qinchuan cattle. [ABSTRACT FROM AUTHOR]

Bu araşt ı rmada, Atatürk Üniversitesi Ziraat Fakültesi Çiftli ğrnde yetiştirilen Esmer ve Siyah Alaca buza ğı lar 30, 45 ve 60. günde sütten kesilmi şler ve buza ğı lara içirilen günlük süt miktar ı doğ um ağı rl ığı n ı n si oran ı nda. tutulmuştur. Esmer ve Siyah Alaca di şi buza ğı lar ı n doğum a ğı rl ı klar ı s ı ras ı yla; 33.6±0.9 ve 32.6±1.6 kg olarak bulunmuştur. 30, 45 ve 60 günde sütten kesilen s ığı rlar ı n 12. ay a ğı rl ı kları ; 205.9±8.0, 204.9±7.4 ve 211.3±5.1 kg , 18. ay a ğı rl ı klar ı ; 289.9±7.8, 283.6±7.2 ve 297.1±4.9 kg olarak bulunmu ştur. Doğ um - onsekiz ay aras ı dönemde günlük canl ı ağı rl ı k artışı ortalamaları 30. günde sütten kesilen buza ğı larda 0.47±0.008 , 45 günlük sütten kesim grubunda 0.46±0.008 ve 60. günde sütten kesilen buza ğı larda 0.49±0.015 kg olarak saptanm ış ve gruplar arası farklar önemsiz bulunmuştur.

Charolais (C)-, Simmental (S)-, and Eastern Anatolian Red (EAR)-sired calves born in 2 locations in Eastern Anatolia were compared in terms of calving traits and preweaning growth characteristics. Breed of sire effects were significant (P < 0.01) for birth weight, 205-day weaning weight, average daily weight gain from birth to weaning, and some body measurements at birth. S- and C-sired calves were heavier at birth and larger for most body measurements at birth than EAR-sired calves. The C- and S-sired calves also had higher 205-day weight than the EAR-sired calves. Although the level of calving difficulty was higher in the S and C crosses, the differences were not statistically significant. Male calves had significantly (P < 0.01) heavier birth and 205-day weights, higher preweaning average daily gain and greater body measurements (e.g., height at withers, heart girth and cannon bone girth) than females. Location differences were also significant (P < 0.01) for survival rate from birth to weaning, preweaning growth rate and 205-day weight. In conclusion, although C- and S- sired calves performed similarly for most traits, all parameters of the preweaning growth were higher in calves sired by S and C bulls than in calves sired by EAR bulls. Therefore, both C and S could be considered as sire breeds for crossbreeding programs to be implemented in Eastern Anatolia, since these breeds did not cause an adverse influence on the calving and growth traits of the crossbred calves. [ABSTRACT FROM AUTHOR]