The effect of different feeding strategies on milk yield and acidosis incidence in Holstein crossbred cows in the rural conditions

Forty eight crossbred Holstein-Kordi cows in 3rd lactation period and from 3rd months of parturition were studied during a four months period. Cows allocated based on body weight in two groups as 550 and 650 kg with two replicates in each group. The mixed model was used for statistical analysis of continuous data. The logistic analysis method was applied for analyzing of data based on the occurrence of acidosis. The experimental treatments were: total mixed ration or TMR (T)، separate feeding of forage and concentrate (P) and traditional feeding method (C). The experimental diets were fed three times daily. The results of study showed that the treatments had a significant effect on milk production and the use of a balanced ration was increased milk production، and decreased the fat and protein percentage (P<0. 05). The effects of village، body weight and month of lactation had a significant effect on milk production (P<0. 01). TMR feeding resulted in lower acidosis incidence as well (P<0. 05).