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: Serum IgG and IgM concentrations of Brown Swiss and Holstein Friesian calves at 2 days of age, weaning, 1 and 4 months of ages were determined in the study. The effect of breeds on the concentration of serum immunoglobulins at various ages was statistically insignificant except for IgM concentration at 2 days of age. Sex had only significant influence (P<0.01) on the IgM concentration obtained at weaning, and female calves had higher IgM concentration than male ones. The correlation (r = -0.39) between IgG concentration and daily weight gains in the period from birth to weaning was found to be negative and highly significant (P<0.01). Also, highly significant and negative relationships between IgM concentration determined at weaning and weights obtained at different stages of growth were determined. Key Words: Immunoglobulins, Calves, Brown Swiss, Holstein Friesian, Growth Esmer ve Siyah Alaca Buzagilarin Serum Immunoglobulin Konsantrasyonlari ve Bunlarin Buyume ve Gelisme Ozellikleri ile Iliskileri OZET : Bu calismada, 2 gunluk, sutten kesim, 1 ve 4 aylik yaslardaki Esmer ve Siyah Alaca buzagilarin serum IgG ve IgM konsantrasyonlari saptanmistir. Iki gunluk yastaki IgM konsantrasyonu haric, farkli yaslardaki serum immunoglobulin konsantrasyonlari uzerine irkin etkisi istatistiksel olarak onemsiz bulunmustur. Sadece, cinsiyetin sutten kesimdeki IgM konsantrasyonu uzerine etkisi onemli olmus, disi buzagilarin IgM konsantrasyonu erkeklerden daha yuksek bulunmustur. Dogumdan sutten kesime kadar olan donemde gunluk canli agirlik artisi ve IgM konsantrasyonu arasinda negatif ve cok onemli derecede (P<0.01) bir korelasyon (r = -0.39) saptanmistir. Ayrica, sutten kesimde olculen IgM konsantrasyonu ile buyumenin farkli donemlerinde belirlenen agirliklar arasinda cok onemli negatif bir iliski belirlenmistir. Anahtar Kelimeler: Immunoglobulinler, buzagilar, Esmer, Siyah Alaca, Buyume

journal of the faculty of agriculture

Serum Immunoglobulin Concentrations of Brown Swiss and Holstein Friesian Calves and Their Relationship with Growth Characteristics / Esmer ve Siyah Alaca Buzağıların Serum İmmunoglobulin Konsantrasyonları ve Bunların Büyüme ve Gelişme Özellikleri ile İliş