This study compared the different leucocyte populations in milk from udders infected with different mastitic pathogens and in different stages of infection. Milk samples were collected from quarters free of intramammary infection, acutely infected with Escherichia coli or Staphylococcus aureus and chronically infected with S. aureus, coagulase-negative staphylococci (CNS) or Streptococcus dysga...

Milk ejection is important during milking or suckling to obtain the alveolar milk fraction, which can represent more than 80% of the milk stored in the udder of dairy cows. In response to tactile teat stimulation, either manually or by the milking machine, milk ejection is induced by the release of oxytocin and resultant myoepithelial contraction. The time from the start of tactile stimulation ...

A total of 648 purebred Holstein and 319 backcross Holstein × Jersey dairy cattle were compared for production, reproduction, health, linear type, and growth traits. Animals were born between 2003 and 2009 and were housed in the University of Wisconsin-Madison Integrated Dairy Facility. All animals had Holstein dams; lactating dams were mated to unproven Holstein sires to produce purebred (cont...

BACKGROUND Ethiopia has high prevalences of udder health problems including clinical and subclinical mastitis across production systems in different livestock species. Previous studies on udder health problems have largely focused on identification of mastitis causing microbial pathogens and associated risk factors. However, relatively little is known about the knowledge and beliefs of livestoc...

Background and Aim Recently, cases of mastitis refractory to treatment have been reported frequently. There are limited routine laboratory investigations on Camelidae infections. Mastitis has been estimated to affect more than 25% of lactating she-camel with up to 70% milk loss. The details of Bacillus spp. pathogenesis in mastitis are not yet fully described. The present study is the first det...

In this paper perinatal mortality is defined as those deaths occurring before, during or within seven days of lambing. Extensive surveys on abortion and stillbirths in sheep from several flocks have been reported from Great Britain (Sellers and Leech 1955; Leech and Sellers 1959; Watson 1962cr), from U.S.A. (Bell 1944, 1947), from New Zealand (McFarlane 1955; Hartley and Boyes 1955, 1964; Hicke...

The objective of this study was to determine whether sow milk yield per gland could be increased by reducing the interval between suckles (suckling interval). Eighteen sows were allocated at their first farrowing to three treatments comprising litter sizes of 6 or 12 piglets or a cross-suckling treatment that was imposed to increase suckling frequency. The cross-suckled treatment comprised two ...

The aim of this study was to investigate the effects of milking frequency reduction and dietary lipid supplementation on intake, BW, and milk yield and composition in high yielding dairy ewes. Ten lactating Assaf ewes were allocated into 2 experimental groups (n = 5). Ewes were fed alfalfa hay ad libitum and 34 g·kg–1 of BW of a concentrate feed with either 0 (Control group) or 43 g of sunfl ow...

Data of 23 189 Merino ewes (8 farms), 7692 Dohne Merino ewes (3 farms) and 2399 SA Mutton Merino ewes (1 farm) were recorded for the 1988-1991 lambing seasons. The udders of ewes present at lamb marking were inspected to differentiate between barren (unlambed), lambed and lost (lambed ewes suckling no progeny), and wet (lambed and suckling ~ 1 lamb) ewes, using the 'wet and dry' technique. The ...

Intramammary infections (IMI) are a complex of inflammatory diseases of the mammary gland. Mastitis is one of the most frequent IMI affecting small dairy ruminants. Direct selection against clinical mastitis is difficult because mastitis is not widely recorded; therefore, somatic cell count (SCC) is promoted as selection criterion for mastitis resistance. A dataset containing 2,475 first-lactat...