A5048626516- Genetic and phenotypic traits in livestock
- Ruminant Nutrition and Digestive Physiology
- Animal Behavior and Welfare Studies
- Reproductive Physiology in Livestock
- Effects of Environmental Stressors on Livestock
- Meat and Animal Product Quality
- Regulation of Appetite and Obesity
- Adipokines, Inflammation, and Metabolic Diseases
- Animal Nutrition and Physiology
- Pasture and Agricultural Systems
- Agricultural Economics and Policy
- Food Supply Chain Traceability
- Biochemical Analysis and Sensing Techniques
- Agriculture, Soil, Plant Science
- Rangeland Management and Livestock Ecology
- Liver Disease Diagnosis and Treatment
- Animal Nutrition and Health
- Agriculture and Rural Development Research
- Adipose Tissue and Metabolism
- Wildlife-Road Interactions and Conservation
- Peroxisome Proliferator-Activated Receptors
- Plant Water Relations and Carbon Dynamics
- Soil Geostatistics and Mapping
- Atmospheric and Environmental Gas Dynamics
- Human-Animal Interaction Studies
University of New England
2007-2021
New South Wales Department of Primary Industries
2006-2020
Poultry CRC
2001-2008
Cooperative Research Centre for Beef Genetic Technologies
2000-2008
Lameness is a clinical symptom associated with number of sheep diseases around the world, having adverse effects on weight gain, fertility, and lamb birth weight, increasing risk secondary diseases. Current methods to identify lame animals rely labour intensive visual inspection. The aim this current study was determine ability collar, leg, ear attached tri-axial accelerometer discriminate between sound gait movement in sheep. Data were separated into 10 s mutually exclusive behaviour epochs...
The present paper covers reproductive performance in an artificial-insemination (AI) program of the Sheep CRC Information Nucleus with 24 699 lambs born at eight locations southern Australia across five lambings between 2007 and 2011. Results from AI frozen semen compared well industry standards for natural mating. Conception rates averaged 72%, 1.45 were per ewe pregnant Merino ewes 1.67 crossbreds. Lamb deaths 21% 15% crossbreds 19%, 22% 20% that mated to terminal, maternal sire types,...
Behaviour is a useful indicator of an individual animal’s overall wellbeing. There widespread agreement that measuring and monitoring behaviour autonomously can provide valuable opportunities to trigger refine on-farm management decisions. Conventionally, this has required visual observation animals across set time period. Technological advancements, such as animal-borne accelerometers, are offering 24/7 capability. Accelerometers have been used in research quantify animal behaviours for...
Journal Article Genetic variation in residual feed intake is associated with body composition, behavior, rumen, heat production, hematology, and immune competence traits Angus cattle Get access Robert M Herd, Herd NSW Department of Primary Industries, Livestock Industries Centre, Armidale, NSW, AustraliaEnvironmental Rural Science, University New England, Australia Search for other works by this author on: Oxford Academic PubMed Google Scholar Jose I Velazco, Velazco Environmental...
Abstract One hundred and eight Holstein-Friesian cows in six herds were run on separate farmlets over a 5-year period from 1995 to 1999 at Wollongbar Agricultural Institute, the subtropical north coast of New South Wales, Australia. Three comprised high genetic merit (HGM) — Australian breeding value (ABV) +49·1 kg for milk fat (F) plus protein (Pr) three low (LGM) cows-ABV 2·3 kg. Within groupings, one herd was given 0·34 t (l), 0·84 (m) 1·71 (h), concentrate per cow lactation. each group,...
This current study investigated whether pre-lambing behavioural changes could be identified with the use of global navigation satellite system (GNSS) technology. GNSS devices were deployed on 20 pregnant Merino ewes grazing a 1.6 ha paddock and their lambing activity was compared metrics derived from spatial data. The aims to evaluate event using following three separate metrics: (1) mean daily speed (MDS) 7 days before after lambing, inclusive (n = 12); (2) hourly (MHS) 12 h 9); (3)...
To investigate how grazing time, herbage dry matter intake (DMI) and rate (IR) are influenced by intensive management, dairy cows strip-grazing subtropical grass pastures (Pennisetum clandestinum) at two compressed sward heights (10 13 cm) five durations (1, 2, 4, 8 15 h) replicated over 3 days were studied. The study was conducted in summer the observed every 20 min from 1600 to 0700 hours calculate time spent (min/h) grazing, ruminating resting. Total 45 longer for 13-cm than those 10-cm...
Identifying the licking behaviour in beef cattle may provide a means to measure time spent for estimating individual block supplement intake. This study aimed determine effectiveness of tri-axial accelerometers deployed neck-collar and an ear-tag, characterise pens. Four, 2-year-old Angus steers weighing 368 ± 9.3 kg (mean SD) were used 14-day study. Four machine learning (ML) algorithms (decision trees [DT], random forest [RF], support vector [SVM] k-nearest neighbour [kNN]) employed...
This paper reports on both the individual and combined effects of age (AFC) liveweight (LWFC) at first calving for Australian Holstein–Friesian heifers lactation production. One hundred thirty-five were allocated to 1 3 AFC treatments. Within each treatment, randomly assigned LWFC Heifers in all groups grazed pasture supplemented when quantity quality was inadequate meet growth requirements. Mean achieved 25.1, 29.9 33.9 months 498, 549 595 kg, respectively. gains from 16 weeks ranged 0.45...
This study used spectral analysis in 2 separate experiments to examine feeding and lying behavior of Bos taurus steers under housing treatments: a feedlot yard stocked at 12.0 m2 per head with dry, firm pen surface (NDF) "high density" (HDF) 6.0 wet muddy surface. The conducted 1 experiment Autumn, another Spring. measured analyzed ambient temperatures, relative humidity, barometric pressure half-hourly onsite, using time series cross-correlations determine whether steer was associated them....
This paper reports on both the individual and combined effects of age liveweight at first calving (AFC LWFC, respectively) for Australian Holstein–Friesian heifers multiple lactation production. One hundred thirty-five were allocated to 1 3 AFC treatments. Within each treatment, randomly assigned LWFC From 16 weeks until calving, in all groups grazed pasture provided with supplementary feed when quantity quality was inadequate meet growth requirements. Mean achieved 25.1 ± 0.121, 29.9 0.11...
Spectral analysis was used to quantify differences in feeding patterns of Angus steers genetically divergent residual feed intake (RFI). Forty-two low RFI (more efficient) and 28 high (less selection line were fed a feedlot diet through electronic feeders for 72 days. Mean (±s.e.) daily 11.9 ± 0.076 12.7 0.095 kg dry matter/day over the 72-day period steers, respectively. The exhibited different temporal cycles time spent feeding. However, number eating sessions, rate, sessions similar....
A procedure is described for solving an open, fully exchanging, three-compartment model representing ruminal volatile fatty acids (VFA) kinetics in sheep. This was solved using results from a published study which labelled VFA, viz. 1-14C-acetate (Ac), 1-14C-propionate (Pr) and 1-14C-butyrate (Bu), were infused individually at constant rate 240 min into the rumen of sheep on different occasions. During tracer infusions, given 75 g lucerne (Medicago sativa) every hour. The patterns increasing...