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Journal of Dairy Science Vol. 82 No. 3 623-631
© 1999 by American Dairy Science Association ®
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Effect of Administration of Vitamin E and Selenium During the Dry Period on Mammary Health and Milk Cell Counts in Dairy Ewes

M. Morgante 1, D. Beghelli 2, M. Pauselli 3, P. Dall'Ara 4, M. Capuccella 5, and S. Ranucci 1

1 Istituto di Semeiotica Medica e Metodologia Clinica Veterinaria, Via S. Costanzo 4, 06126 Perugia, Italy
2 Facoltà di Medicina Veterinaria di Camerino, Via Circonvallazione 93/95, 62024 Matelica, Italy
3 Istituto di Zootecnica Generale, Via Borgo XX Giugno, 06126 Perugia, Italy
4 Istituto di Microbiologia Veterinaria, Via Celoria 10, 20133 Milano, Italy
5 Centro Latte Regione Umbria, 06126 Perugia, Italy

The effect of parenteral administration of two subcutaneous injections of vitamin E and Se (5 mg and 0.1 mg/kg of body weight, respectively) during the dry period on the mammary health and milk somatic cell counts of 25 dairy ewes was investigated. Supplementation reduced somatic cell counts (5.4 vs. 6.0 log10) during the subsequent lactation but had no effect on the incidence of clinical mastitis (4% vs. 6%) and intramammary infections (9.0% vs. 11.3%). Furthermore, the administration of vitamin E and Se was associated with differences in differential cell counts of milk samples (macrophages, 48.8% vs. 38.4%; polymorphonuclear neutrophils, 40.1% vs. 50.7%; and eosinophils, 0.7% vs. 1.4% for control ewes and ewes receiving supplements, respectively). The administration of these supplements also increased erythrocyte glutathione peroxidase activity (139.5 vs. 86.3 U/ml of packed cell volume) and the percentage of blood neutrophils that reduced nitroblue tetrazolium after bacterial extract stimulation (48.6% vs. 38.7%). Parenteral administration of vitamin E and Se to ewes during the dry period appeared to have influenced mammary gland status during the subsequent lactation and particularly total and differential milk cell counts.

Key Words: vitamin E • selenium • somatic cell count • dairy ewes

Submitted on April 16, 1998
Accepted on October 26, 1998




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