Blood growth hormone level as an indicator to some lactation characteristics in Butana cows

Mohamed A. Bakheet, Mohammed E. Mohammed, Greeballa H. Elobied


This study was conducted at Atbara Animal Breeding Research Station in December 2006. The objectives of the study were to determine the blood growth hormone (GH) level in Butana cows and to investigate its relationship with some lactation characteristics and to develop a model to predict milk yield and lactation length in Butana cattle using the blood growth hormone level. Blood samples were collected from 12 cows in different lactation seasons. For each cow, milk yield as well as lactation length were recorded. Plasma GH level was determined using radioimmunoassay (RIA) technique. The results showed that, the mean blood GH level in Butana cows was 12.36 (mm/l). Also, it showed that blood GH level was positively correlated with daily milk yield (P < 0.01) and lactation length (P < 0.05). The coefficients of determination for the milk yield and lactation length using blood GH level were 0.61 and 0.41, respectively. Based on the previous findings, it could be recommended that, in addition to blood GH Level, other factors may be included in future models for prediction of milk yield and lactation length using large numbers of cows. GH level alone is a poor predictor for milk yield and lactation length.

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