Productive and reproductive performance of Friesian cows as affected by somatotropin treatment
Abstract: Twenty-four lactating Friesian cows were used to study the effect of bovine somatotropin hormone (bSTH) injection on milk production,milk composition and reproductive performances. The experiment was started 5wk postpartum and continued for five months. Cows were divided into two similar groups (n=12 each).
The first group was used as control, while each cow in the second group was injected subcutaneously with 500-mg bST every 2 weeks.
The study showed that bST enhanced the production of fat-corrected milk yield by 30%more than non-treated cows. Concentrations of fat and total solids of milk produced from treated cows also increased by 31 and 12% , respectively.
Cows that received bST consumed more feed and were more efficient in feed conversion than the control group. Both body weight and body condition scores of treated cows were significantly (P<0.05) decreased compared to the control. No significant difference between groups was recorded for days to first service and number of services per conception, while days open period of treated cows was significantly (P<0.05) longer than that of the control. BST-treated cows display lower conception rate than the control by 33%.
We concluded that treating cows with Bst early in lactation increases milk production and milk fat and total solids. Body weight and body condition decrease despite of an increase in dry matter intake after bST treatment negatively affects days open and conception rate in Friesian cows under the Egyptian conditions.
Publication year 2001
Pages 199-208
Availability location معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
Availability number
Organization Name
serial title Journal Egyptian Veterinarian Medical Association
Author(s) from ARC
Agris Categories Animal physiology - NutritionAnimal physiology - Reproduction
AGROVOC
TERMS		 Cows. Hormones. Milk production. Perinatal period. Reproductive performance. Somatotropin.
Proposed Agrovoc milk composition;
Publication Type Journal
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