INTRODUCTION During the last decade the emphasis in animal production has switched from promoting maximum or near maximum growth to altering the efficiency and composition of growth, and the enhancement of lean tissue growth or protein accretion. These changes have been brought about by increasing consumer demand for leaner meat products, and the realization that at the same level of feed or en...

Variation in residual feed intake, that is, variation in feed intake in relation to liveweight (LW) and growth rate, was investigated using data from 540 progeny of 154 British Hereford sires, collected over ten 200-day postweaning performance tests conducted between 1979 and 1988. Residual feed intake (RFI ) was calculated for each test as the difference between Reg actual feed and expected fe...

There has been mounting interest over the proposed production and environmental benefits from using perennial ryegrass cultivars bred to have higher water soluble carbohydrate content (high sugar grasses). Here, we objectively review published evidence, from the EU and New Zealand, of the effects of these on milk yield per cow, liveweight gain in sheep, N utilisation and wider trophic interacti...

As a climate change assessment criterion, carbon footprint CO2 equivalent (CF, CO2e) is used to evaluate the sustainability of aquaculture in terms its contribution greenhouse gas emissions. In this study, three-year CF rainbow trout production with cage farming project capacity 49 tonnes/year was calculated. The average farm for three years 52.72 %. Total expended summation on feed, general ma...

Context Blood and rumen contents, which are currently considered wastes in many abattoirs, could be valuable ingredients poultry feeding; however, several factors including high fibre low energy may limit their dietary inclusion. There is need for more research on feed processing diet formulation to maximise utilisation of these by-products feeding. Aim We investigated the effect broiler finish...

Context Leucaena leucocephala (leucaena) is a leguminous shrub adapted to higher rainfall (>600 mm) in frost-free areas of Australia. It can be source high-quality forage for cattle grazing tropical grass-based pastures that are seasonally deficient the nitrogen content required adequate levels performance. contains bioactive compounds may reduce methanogenesis rumen, helping achieve Austral...