Study on Effect of Crude Protein in Different Stages of Lactation of Holstein Friesian Cow

Abstract

40 Holstein Friesian cows in two farms were selected for the evaluation of the milk production in the 2nd and 3rd lactation and feed them concentrate feed. All the cows were free from any physical deformities and there was no clinical mastitis in this animal, BCS (Body condition score) was almost 3. 20 cows received mixed feed on one farm, whereas 20 cows received company feed on another farm. Chemical analysis of feed samples was DM, Moisture, CP, CF, and EE. The value of Crude protein in the concentrate mixture was 16% and the company feed was 20%. The analysis of all milking data revealed that animals with low protein intake make less milk, whereas those with high protein intake produce more milk than those with low protein intake. The main goal of this study is to establish a relationship between crude protein and milk production in different lactation periods.