Results 161 to 170 of about 338,888 (190)
Some of the next articles are maybe not open access.
II. Breeds and breeding practices
New Zealand Journal of Experimental Agriculture, 1979Abstract A national questionnaire of farms with pigs, carried out in April 1977, was used as a source of data on the extent of use of purebred v. homebred stock in commercial herds, the fate and average age of performance-tested boars, the extent of crossbreeding, and the identity of breeds and crossbred types of stock.
openaire +1 more source
Breeding (2): Ecology of Breeding
1996Once breeding activity has been initiated under the influence of the various environmental stimuli described in the previous chapter, courtship, nestbuilding (where relevant) and subsequent parental behaviour follow in sequence. These activities may involve finding appropriate nesting materials (for example, green grass in the case of weavers Ploceus ...
openaire +1 more source
Breeding (1): Timing of Breeding
1996With regard to the timing of breeding in birds, “by far the most important ultimate factor for nearly all species of birds is the availability of an adequate food supply…. Each species has therefore evolved the timing of its breeding so that it coincides with a maximum availability of its species-specific food” (Immelmann 1971).
openaire +1 more source