منابع مشابه
Genetic parameters for ostrich incubation traits in South Africa
Z. Brand, S.W.P. Cloete, I.A. Malecki and C.R. Brown 1 Department of Animal Sciences, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa 2 Institute for Animal Production, Oudtshoorn, PO Box 313, Oudtshoorn 6620, South Africa 3 Institute for Animal Production, Elsenburg, Private Bag X1, Elsenburg 7607, South Africa 4 School of Biology, Faculty of Natural and Agricultural S...
متن کاملSystematic factors that affect ostrich egg incubation traits
Z. Brand, S.W.P. Cloete, C.R. Brown and I.A. Malecki 1 Department of Animal Sciences, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa 2 Institute for Animal Production: Oudtshoorn, PO Box 313, Oudtshoorn 6620, South Africa 3 Institute for Animal Production: Elsenburg, Private Bag X1, Elsenburg 7607, South Africa 4 Institute of Science & the Environment, University of Wo...
متن کاملInfluence of incubation management on pipping position, hatching ability and survival of ostrich chicks
Despite numerous studies, the effect of artificial incubation on the hatchability and survival of nearterm ostrich chicks is still not well understood. Records from 13 975 eggs with embryos of 35 days and older, artificially incubated between 2006 and 2008, were analysed to determine the potential effect of pipping position upon the hatchability, and the subsequent survival of ostrich chicks. A...
متن کاملFactors related to shell deaths during artificial incubation of ostrich eggs.
The ostrich industry experiences a high rate of embryonic mortalities during artificial incubation of eggs. Embryonic deaths were studied from data recorded on 37,740 fertile eggs incubated artificially during the 1998-2005 breeding seasons. Roughly 10,000 eggs that sustained embryonic mortalities were classified according to the stage and nature of death, i.e. before 21 days of incubation, aft...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Nature
سال: 1883
ISSN: 0028-0836,1476-4687
DOI: 10.1038/027507d0