Kevin J O'Farrell

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In two studies on overcrowding and foot lesion development, claw health was monitored monthly, and behavioural activities such as lying/standing observed every 15 min for 5 consecutive days and nights each month of the housing season. In the first experiment, 35 autumn-calving heifers were housed at a 2:1 heifer to cubicle ratio immediately after calving.(More)
The effect of genetic merit for milk production traits - fat, protein and milk yield - in dairy cows on milk production, body condition, blood metabolites, reproductive hormones, feed intake and reproductive performance was studied over a period of 2 years. Cows were grouped into two categories, based on calculated pedigree indices using multiple-trait(More)
Spring-calving Friesian heifers were randomly allocated either to Dutch Comfort cubicles (2130 x 1160 mm) bedded with rubber mats or to modified Newton Rigg cubicles (2060 x 1090 mm) without bedding. Their behavioural activities, including lying down and standing, were monitored every 30 minutes for two days and two nights each week from November to March,(More)
The objective of this experiment was to evaluate various programmes for synchronization of oestrus. The focus of the study was to evaluate rates of detection of oestrus, synchrony of oestrus, pregnancy rate, and effect of ovarian status at initiation of the programmes on rates of detection of oestrus and pregnancy rate. Spring-calving, lactating dairy cows(More)
The efficacy of a whey protein concentrate was evaluated as a colostrum substitute or supplement in two experiments using four groups of 29 calves. In Experiment 1, calves were fed either 2 L of pooled colostrum (group 1) or 500 g of whey protein concentrate (group 2). A mean total of 123.6 and 17.7 g of Ig was fed to calves in groups 1 and 2, respectively.(More)
The aims of the present study were to compare (1) Holstein-Friesian heifers versus early postpartum lactating cows, and (2) different age categories of crossbred beef heifers versus cows, in terms of oocyte yield, morphological quality and developmental competence. Four experiments were designed to test the associated hypotheses. In Experiment 1, ovum pick(More)
The concentrations of polychlorinated dibenzo-p-dioxins, furans and polychlorinated biphenyls (PCBs) were measured in pooled bovine milk samples collected between 1991 and 2005 in County Cork, Ireland. The pooled samples were of bulk-tank milk collected from farms adjacent to industrial, chemical and pharmaceutical installations (target milk) or from rural(More)
The objectives of this experiment were to evaluate the effect of various estrus synchronization programs on estrus detection rate (EDR) and pregnancy rate (PR) in lactating cows. Spring-calving, lactating dairy cows (n = 3,096) were allocated to one of six treatments: 1) PG (n = 514), estrus detection for 10 d before the onset of the breeding season (BS),(More)
Since 1994, Irish cattle have been exposed to greater risks of acquiring Mycobacterium avium subspecies paratuberculosis (MAP) infection as a consequence of the importation of over 70,000 animals from continental Europe. In recent years, there has been an increase in the number of reported clinical cases of paratuberculosis in Ireland. This study examines(More)