A5077697893- Ruminant Nutrition and Digestive Physiology
- Genetic and phenotypic traits in livestock
- Wildlife Ecology and Conservation
- Reproductive Physiology in Livestock
- Meat and Animal Product Quality
- Animal Nutrition and Physiology
- Ecology and biodiversity studies
- Pasture and Agricultural Systems
- Animal Diversity and Health Studies
- Effects of Environmental Stressors on Livestock
- Agronomic Practices and Intercropping Systems
- Rangeland Management and Livestock Ecology
- Agroforestry and silvopastoral systems
- Genetic Mapping and Diversity in Plants and Animals
- Fatty Acid Research and Health
- Agriculture Sustainability and Environmental Impact
- Agriculture, Soil, Plant Science
- Agricultural Economics and Policy
- Rangeland and Wildlife Management
- Weed Control and Herbicide Applications
- Animal Behavior and Welfare Studies
- Soil and Water Nutrient Dynamics
- Animal health and immunology
- Healthcare cost, quality, practices
- Artificial Intelligence in Healthcare and Education
Uppsala University
2025
Farm Foundation
2020-2023
Waitemata District Health Board
2012-2023
Hawke's Bay Hospital
1988-2020
AgResearch
1993-2001
University of Canterbury
1987-1988
Lincoln University
1981-1988
Ministry of Health
1981
Abstract Antimicrobial resistance (AMR) is an increasing problem worldwide, and new treatment options for bacterial infections are direly needed. Engineered probiotics show strong potential in treating or preventing infections. However, one concern with the use of live bacteria risk acquiring genes encoding AMR virulence factors through horizontal gene transfer (HGT), transformation probiotic into a superbug. Therefore, we developed engineered CRISPR-Cas9 system that protects from transfer....
Abstract Two serial slaughter experiments were conducted to compare the liveweight gain and carcass quality of 3‐year‐old Angus steers finished on concentrate‐based rations with high spring pasture in New Zealand. Experiment 1 used a feedlot ration 70% maize grain 30% silage 2 barley instead maize. In both experiments, adjusted concentrate prior being fed ad libitum for 12 weeks. Finishing regime led significant difference weight (363 407 kg grain, respectively). There was no final 2. effect...
Summary Kinetic studies of Ca metabolism, using 45 CaCl 32 , were carried out on two mature red deer stags during the period maximum rate deposition in antlers. They offered green-feed oats to provide energy for maintenance; diet provided approximately 42mg Ca/kg W per day. appeared be irreversibly lost from circulation into antlers and could treated kinetic purposes same way as loss body milk. The size rapidly exchangeable pool body, excluding antlers, was 0·21 g/kg W, similar estimates...
This study looked at ewe effects on the number of lambs reared (litter size and mortality) lamb 12 week weight (birth growth rate). Over six years, data was collected 5571 born to around 3390 Romney (R), Finn cross (F x R), East Friesian (EF R) Poll Dorset (PD ewes. Ewe live weights were recorded pre-lambing weeks post-lambing. Lambs weighed birth played a significant role in affecting productivity system many cumulative. lambing percentage (lambs born/ewes lambing) 165 %. Two tooth ewes had...
Abstract In a study of antler growth and mineralisation, 18 red deer stags aged 4 years older were individually penned immediately before during offered one three pelleted rations which varied in protein calcium (Ca) content. One was removed from stag each treatment group at 28, 42, 56, 70, 91, 112 days growth. The contralateral when epidermal tissue began to be shed (velvet shedding). No effect nutritional on detected. Mean time velvet shedding 164 after the start Date casting (range = 56...
Samples of M longissimus thoracis et lumborum from 78 heavy steers (41 Angus, 37 Simmental) finished on three feed types (26 annual pasture, 25 perennial 27 70% grain) were analysed for fatty acid composition triacylglycerols and polar lipids. High levels a wide range intramuscular lipid (105.8 g kg−1, SD = 34.8) due to the very high mean carcass weight 504.5 kg. Intramuscular did not differ significantly between breeds or types. Significant differences shown most acids measured in both...
Persistence of herbage yield is an important productivity trait grass species and cultivars in New Zealand pastures. However, relatively little known about genetic variation this trait, principally because few studies comparing have continued beyond 3 years. This paper reports results from a comparison 25 perennial ryegrass representing wide range functional types backgrounds conducted under sheep grazing summer-dry environment. Dry matter (DM) was measured for the first years after sowing,...
Abstract The effect of dietary vitamin A supplements on plasma carotenoid (PC), liver B‐carotene, and fat concentrations, colour in cattle were determined three experiments. In Experiment 1, thirteen 2‐year‐old Angus × Friesian steers grazed pasture, 6 the supplemented daily with 1 106 IU for 83 days. 2, twenty crossbred heifers pasture 5 being 2.5 31 Cattle Experiments 2 slaughtered at end experiments, samples analysed retinol concentrations respectively both 2. 3 involved ninety 3‐year‐old...
Abstract Grazing behaviour was recorded in sambar deer and red for 24-h continuous periods, at 2-monthly intervals, over 12 months from March 1990 to 1991. Scan-sampling used, with observations made every min. Both groups of grazed separate but adjoining areas the same pasture duration study. Sambar most actively during night (0100–0500 h), late afternoon, evening (1700–2100 whereas intensely early morning (0500–0700 (1500–2000 h). This species difference grazing pattern not altered by...
Abstract An experiment was carried out to compare the quality of beef produced from Hereford (H), × Friesian (HF), and (F) steers grazed together on pasture weaning. Carcass characteristics, meat parameters, consumer acceptability were compared when breeds slaughtered at same age (H, HF1, Fl) level "fatness" (i.e., biological maturity; H, HF2, F2). H reached slaughter weight fatness 27 months (approx. 610 kg, 6.75 mm fat 12th rib, respectively) which time all half Friesians (HF1), (Fl)...
Abstract Eating quality attributes of lean meat were examined for lambs from two growth performance trials. The had grazed one seven pure‐sward pastures—ryegrass, tall fescue, cocksfoot, Phalaris, lucerne, chicory, and prairie grass—in Hawkes Bay during late summer in 1992 1993. Phalaris diet caused a 73% incidence staggers 52% Ryegrass was minimal absent Frozen (m. longissimus thoracicus et lumborum) 10 animals each treatment cooked to 75°C endpoint served panelists who assessed samples...
Anterior compartment syndrome (ACS) and rhabdomyolysis are rare complications of hypothyroid myopathy. We report the case a young man with rapid onset ACS who presented simultaneous primary hypothyroidism adrenal insufficiency associated acute renal failure, hyponatremia, hyperkalemia.A 22-year-old presenting one-month history tiredness, hyperpigmentation, cramps in his calves was found to have severe bilateral foot drop. Investigations revealed insufficiency, evidence myoglobinuria....
Artificial Intelligence (AI) is undergoing rapid development, meaning that potential risks in application are not able to be fully understood. Multiple international principles and guidance documents have been published guide the implementation of AI tools various industries, including healthcare practice. In Aotearoa New Zealand (NZ) we recognised challenge went beyond simply adapting existing risk frameworks governance our specific health service context population. We also deemed...
Abstract Several biological measurements were made on captive sambar deer over 3 years (1989–92). Calving occurred from January to November, with a peak in April/May. Mean calving date was 8 May (SD = 71.3 days; n 31). Calf mortality at birth 28% (12/43), the major causes being adult aggression and inclement weather. Mortality higher stag calves (41%) than hind (6%). Most stags velvet antler between April (mean 125 SD 22.6 days), hard November 231 40.0 during which time rutting behaviour...
SUMMARY Grazing sambar and red deer in New Zealand were offered a free choice of seven different plant species (forage legumes, browse grasses) 1992 1993 dietary preference rankings determined. Nutritive value plants on offer diet selected, height, purity stem diameter selected (browse only) also Total nitrogen (N) organic matter digestibility (OMD) highest for clover, lowest grasses intermediate (willow, poplar lupin). Top ranking was willow clover both years, with Yorkshire fog prairie...
The artificial insemination of 400 red deer hinds with sambar semen resulted in 31 pregnancies at day 40 (24 100) and the birth four calves. Only one female calf was born alive. 10 five 40, which none went to term. Gel electrophoresis three blood proteins confirmed live as first documented × hydrid. G-banded karyotypes were consistent (2n = 62; six unpaired paired metacentric autosomes) being offspring a dam 68; single pair sire 56; seven pairs autosomes).
Abstract Available literature mainly describes the fatty acid (FA) content of raw meat, with only limited data explaining effect different preparation and cooking temperatures on health‐promoting FA such as conjugated linoleic (CLA), its metabolic precursor trans‐vaccenic (TVA), long chain omega‐3 (LC FA). We collected m. longissimus thoracis (LT) from rib chops Poll Dorset × East Friesian (EF) Romney (R) lambs raised together. The composition LT was compared prepared bone all fat trimmed...
Composite ewes (244 single, 258 twin and 255 triplet born) lambed first either as a one or two-year-old. One-year-old lambing resulted in lighter at both 2nd 3rd mating. Twin born were than single throughout their life. Ewe losses due to one-year-old meant fewer left lamb later years. This that after the two-year-old weaned more lambs per original ewe had previously. difference got smaller over time extra hogget produced total (6.7 vs. 5.9 lambs, P < 0.05). Lifetime weaning weight did not...
Four annual clovers (Arrowleaf (Trifolium versiculosum), balansa (T. michelianum), Persian resupinatum) and gland glanduliferum)) were sown on five East Coast dryland farms one moist Taranaki site. Hardseededness was measured at all sites seed production hardseededness three following different closing dates. There no differences in size for any species between or High levels of (500-700 kg/ha) set by arrowleaf after an early date (early September). Flowering decreased with later closings....
Abstract The effects of winter nutrition on date antler casting and subsequent weight velvet in red deer (Cervus elaphus) was investigated two environments (Farm L, lowland; Farm H, high country). On each property three groups mature, mixed-age stags were offered a pelleted feed ad libitum, half or not at all. All had access to hay limited pasture. Both supplemented gained the unsupplemented group lost both properties. Only H affected by treatment this may have been related effect intake...
A study was undertaken to evaluate the relative importance of milk and pasture lamb growth during lactation under a high performance production system. total 285 East Friesian x Romney (EFxR), Finn (FxR) (R) maiden 2-tooth ewes lambed following insemination with semen from six rate Poll Dorset composite rams. Mean lambing date 16 July 1998. Breed groups were run together in either single or twin mobs fed at levels nutrition (pasture covers maintained 1400 kg DM/ha greater throughout...