Experiments during 4 years examined the diets selected, growth, and responses to N supplements by Bos indicus-cross steers grazing summer-rainfall semi-arid C4 Astrebla spp. (Mitchell grass) rangelands at a site in north-western Queensland, Australia. Paddock groups of were not supplemented (T-NIL), or fed non-protein (T-NPN) cottonseed meal (T-CSM) supplement. In Experiment 1, young older meas...

Context Poor nutrition of late-pregnant cows is highly prevalent in the dry tropics and associated with high levels calf mortality. Aims It was hypothesised that supplementation protein to prepartum would restore normal decline progesterone increase transfer passive immunity calves, this being further enhanced by inclusion yeast fermentation products. Methods In total, 84 heifers 45 were select...

Over many decades there has been a global trend away from mixed farming and integrated crop-livestock systems to more-intensive single commodity systems. This distorted local nutrient balances, resulting in environmental pollution as well soil depletion. Future food should include with tight budgets. For nitrogen (N), detailed understanding of processes, fluxes – including gaseous forms budgets...

Circulating concentrations of leptin in sheep correlate with body fatness and are affected by level of food intake and photoperiod. The present objective was to elucidate the short-term dynamics of leptin secretion. Frequent blood samples were taken over 48 h from 12 Soay rams after 16 weeks in short-day photoperiod (SD, 16 h darkness:8 h light) with freely available food, and then after 16 wee...

a total of 20 suckling sanjabi lambs, comprised of 10 males and 10 females with respective liveweights of 13.40±1.34 and 11.62±0.85 kg were employed in a 2x2 factorial experimental arrangement. the lambs within their sexes were grouped according to their liveweights and then randomly allocated to either one of the two treatments namely: ad libitum good quality alfalfa hay plus free suckling (co...