Zinc, Copper, and Manganese Homeostasis and Potential Trace Metal Accumulation in Dairy Cows: Longitudinal Study from Late Lactation to Subsequent Mid-Lactation.

Background: Trace metals are supplemented in cattle to prevent nutrient deficiencies. Levels supplemented to mitigate worst-case basal supply and availability scenarios can, however, result in trace metal intakes far above the nutritional requirements of dairy cows with high feed intakes.

Objectives: We evaluated Zn, Mn, and Cu balance in dairy cows from late lactation through the subsequent mid-lactation, a period of 24 wk characterized by large changes in dry matter intake.

Mineral and vitamin supplementation on sheep farms: a survey of practices and farmer knowledge.

Mineral and vitamin (MV) supplementation is a routine management practice in many pasture-based systems of prime lamb production. The aim of the current study was to establish the MV supplementation practices on Irish sheep farms and farmer's knowledge and opinions in relation to supplementation strategies and MV deficiencies. A survey, consisting of 22 questions, was administered to all farmers participating in the Teagasc National Farm Survey (NFS) in 2016 which had a sheep enterprise ( = 177).

Evaluation of the solubility of a range of copper sources and the effects of iron & sulphur on copper solubility under rumen simulated conditions.

Background: Antagonisms exist in vivo which inhibit copper bioavailability in ruminants. Although the antagonism between iron, sulphur and copper has been well observed in vivo in practice the mechanism by which it acts has not yet been elucidated, nor the compound it creates identified. This results in problems when trying to optimise supplementation to prevent the interaction from occurring or provide a copper source which is able to negate its effects.

A reconnaissance survey of farmers' awareness of hypomagnesaemic tetany in UK cattle and sheep farms.

Hypomagnesaemic tetany (HypoMgT) in ruminants is a physiological disorder caused by inadequate intake or impaired absorption of magnesium (Mg) in the gut. If it is not detected and treated in time, HypoMgT can cause the death of the affected animal. A semi-structured questionnaire survey was conducted from July 2016-2017 to assess farmers' awareness of HypoMgT in cattle and sheep in the UK.

Linking theory to practice in an undergraduate veterinary curriculum: students' perspectives.

Facilitated clinical relevance (FCR) at the University of Nottingham School of Veterinary Medicine and Science is a small-group educational model that promotes student-centered learning. The objectives of this study were: (1) to examine students' opinions of FCR as a learning approach compared with other teaching methods; and (2) to establish if gender, year of study, or prior exposure to FCR were predictors of attitude. Questionnaires were distributed to undergraduate veterinary students (N = 185) in the first and second year of study.

A review of the effects of supplementary nutrition in the ewe on the concentrations of reproductive and metabolic hormones and the mechanisms that regulate folliculogenesis and ovulation rate.

This paper discusses the phenomenon of nutritional flushing in ewes whereby increased nutrition stimulates folliculogenesis and ovulation rate. In addition the paper reviews recent findings on the effects of increased levels of nutrition on the blood concentrations of reproductive and metabolic hormones in the ewe and some of the intraovarian changes that take place in response to nutritional stimulation. Finally, in the paper, we propose a model of the physiological mechanism for the nutritional stimulation of folliculogenesis and we review how closely the model fits recent published and unpublished evidence examining the mechanism of flushing.

Defining endometrial growth during the menstrual cycle with three-dimensional ultrasound.

Objective: To define the changes in endometrial morphometry that occur during the normal menstrual cycle and to examine the discriminatory power of volumetric analysis over conventional two-dimensional measurements in quantifying the effect of compounding factors on endometrial growth.

Design: The design was that of a longitudinal observational study. Subjects were seen on an alternate-day basis until ovulation and then every four days until the next menstrual period.