The Natural Protected Area Peninsula Valdés, located in Northeastern Patagonia, is one of the largest conservation units of arid lands in Argentina. Although this area has been in the UNESCO World Heritage List since 1999, it has been continually exposed to sheep grazing and cattle farming for more than a century which have had a negative impact on the local environment. Our aim is to describe ...

Abstract The purpose of this study was to evaluate the quality mountain sheep milk obtained from animals kept on pastures: natural and organic. experimental procedure conducted under production conditions, during annual grazing two pastures in region Polish Carpathians: organic pasture certified for farming belonging National Park. This showed greater plant species diversity pasture, but its yi...

a terrier came along. Through my binoculars, I saw the lapwing becoming increasingly anxious and, when the intruders were about 200 metres away, the bird ran off to trail a wing in front of them. The restrained dog clearly wanted to chase the injury-feigning bird and, had it been allowed to do so, would have been led well away from the nest. The lapwing's distraction would almost certainly have...

Biological indicators that can be used to predict the sensitivity of animals to environmental changes are of interest to the sheep industry for economic and welfare reasons. The coefficient of variation of fibre diameter (HCVFD) is a potential indicator of environmental sensitivity and tends to be negatively correlated with fatness. To further understand the association of HCVFD with the sensit...

involved in choosing appropriate criteria and procedures for problem~ ses of breed and mating system evaluation experiments in sheep are. nom lC ana iiterature is rev1ewed of expenments 1n Wh1Ch blOlog1cal or econom1C scn bed . has been investigated. The .range in relative economic merit from the lCl ency the best group in an expenment tYP1cally 1S from 100 to 120, w1th rest to 140 not uncommon...

Four groups of 6-7-month-old Merino lambs were each dosed with 40 000 infective larvae of Trichostrongylus axei on 2 November 1976 and subsequently exposed to challenge with Haemonchus contortus on natural grazing at the University of Pretoria's Experimental Farm in the eastern suburbs of Pretoria. One of these groups and one group of controls were killed every 8 weeks from the end of December ...

A model analyzing the economics of sheep farming is formulated. The basic idea is simple. Sheep are capital and they are held by farmers as long as their capital value exceeds their slaughter, or meat, value. The farmers are therefore portfolio managers aiming to find the optimal combination of different categories of animals and the yields are compared with the yields from other assets. The mo...

Grasslands in tropical environments are characterized by greater diversity than is found in temperate areas. In South Africa, greater diversity is found with the seasonally limited production which occurs on dystrophic soils under humid conditions in the sourveld, as opposed to the year round production that occurs on eutrophic soils under warm and drier conditions in the sweetveld. Most of the...