title: The Technical and Financial Effects of Parenteral Supplementation with Selenium and Vitamin E during Late Pregnancy and the Early Lactation Period on the Productivity of Dairy Cattle.
abstract: This study aimed to determine the effects of parenteral selenium (Se) and vitamin E supplementation on economic impact, milk yield, and some reproductive parameters in high-yield dairy cows in the dry period and in those at the beginning of lactation. At the beginning of the dry period, cows (n = 323) were randomly divided into three groups as follows: Treatment 1 (T1), Treatment 2 (T2), and Control (C). Cows in group T1 received this preparation 21 days before calving and on calving day, and cows in group T2 received it only on calving day. The cows in the control group did not receive this preparation. Supplementation with Se increased Se serum levels of cows treated at calving day (p<0.05). Differences in milk yield at all weeks and the electrical conductivity values at the 8th and 12th weeks were significant (p<0.05). Supplementation with Se and Vitamin E decreased the incidence of metritis, the number of services per conception and the service period, but had no effects on the incidence of retained fetal membrane. A partial budgeting analysis indicated that Se supplementation was economically profitable; cows in group T1 averaged 240.6$ per cow, those in group T2 averaged 224.6$ per cow. Supplementation with Se and Vitamin E has been found to increase serum Se levels, milk yield, and has positive effects on udder health by decreasing milk conductivity values and incidence of sub-clinical mastitis.
authors.affiliation: Department of Animal Health Economics and Management, Faculty of Veterinary Medicine, Dicle University, Diyarbakir 21280, Turkey .
authors.forename: T
authors.initials: T
authors.lastname: Bayril
authors.affiliation: Department of Animal Health Economics and Management, Faculty of Veterinary Medicine, Dicle University, Diyarbakir 21280, Turkey .
authors.forename: A S
authors.initials: AS
authors.lastname: Yildiz
authors.affiliation: Department of Nutrition, Faculty of Fisheries, Inonu University, Malatya 44280, Turkey .
authors.forename: F
authors.initials: F
authors.lastname: Akdemir
authors.affiliation: Department of Animal Health Economics and Management, Faculty of Veterinary Medicine, Dicle University, Diyarbakir 21280, Turkey .
authors.forename: C
authors.initials: C
authors.lastname: Yalcin
authors.affiliation: Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Dicle University, Diyarbakir 21280, Turkey .
authors.forename: M
authors.initials: M
authors.lastname: Köse
authors.affiliation: Department of Animal Husbandry, Faculty of Veterinary Medicine, Yuzuncu Yil University, Van 65280, Turkey .
authors.forename: O
authors.initials: O
authors.lastname: Yilmaz
keywords: Dairy Cattle; Milk Yield; Partial Budget Analysis; Reproductive Parameters; Selenium; Vitamin E