Abstract
Effects of cooling and supplemental recombinant bovine somatotropin (rbST) on hemato-biochemical characteristics were studied at different stages of lactation of crossbred Holstein Friesian cows in a tropical environment. Ten primiparous cows were divided into two groups of five animals each. The first group was housed as the non-cooled animals in an open-sided barn with a tiled roof in a normal shaded house (NS), while the second group was housed as cooled cows in an open-sided barn with a tiled roof under misty fan cooling (MFC). Three injections with rbST (500 mg per dose) at each stage of lactation (early, mid and late lactation) significantly increased total milk yield as compared with pretreatment in both cooled and non-cooled cows. Milk fat was significantly increased, while total solids, solid not fat, milk protein and lactose were not affected by the rbST treatment. Hematological parameters, plasma proteins, albumin, glucose, triglyceride, cholesterol, creatinine, alkaline phosphatase (ALP), plasma inorganic phosphate and the activities of plasma aspartate aminotransferase (AST) and alanine aminotransferase (ALT) were not affected by supplemental rbST in cooled and non-cooled cows. Supplementation of rbST caused a significant decrease in plasma urea concentration, while plasma FFA concentrations significantly increased in both cooled and non-cooled cows. The results of the present study suggest that exogenous rbST is efficacious in increasing milk yield without adverse effects on lactating crossbred Holstein cows in a tropical environment.
Highlights
Low milk yield and short persistency of lactation of dairy cattle is still the major problem for dairy practices in the tropics
A previous study in crossbred cattle containing 87.5% Holstein Friesian (HF) genes found that a short persistency of lactation accompanied decreases in plasma bovine somatotropin level and blood flow to the mammary gland during the transition period from early to mid-lactation (Chaiyabutr et al, 2000)
Cows treated with recombinant bovine somatotropin (rbST) exhibited increased milk yield which coincided with increases in both total body water and mammary blood flow (Chaiyabutr et al, 2007)
Summary
Low milk yield and short persistency of lactation of dairy cattle is still the major problem for dairy practices in the tropics. Cows treated with rbST exhibited increased milk yield which coincided with increases in both total body water and mammary blood flow (Chaiyabutr et al, 2007). The changes in relative Pine apple waste mass of many organs and tissue growth following bST administration have been reported (Moallem et al, 2004), which may reflect changes in bodily functions According to this information, blood analysis will be a useful tool and a priority for diagnosis and health monitoring of animals in veterinary medicine (Payne and Payne, 1987) in prevention of metabolic disease or other disorders during intensive milk production. Few data are available for the additive effects of supplemental rbST and cooling on both health and productivity of crossbred dairy cattle in tropical environments. The results of this study will provide values of hematology and blood metabolites for systematic health
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