Breeding Season and Litter Size in Japanese
نویسندگان
چکیده
منابع مشابه
Seasonality in oestrus and litter size in an assistance dog breeding colony in the United Kingdom
Evidence of seasonality in oestrus in bitches within specialist breeding programmes, such as those for assistance dogs, may support colony management through tailoring the distribution of resources required for breeding throughout the year. However, at present there are conflicting data regarding seasonality in oestrus (and litter size) in domestic dogs. The primary objective of this study was ...
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The breeding ecology of White and Japanese Wagtails, Motacilla alba and M . grandis, was studied along a river in central Japan. The home ranges of the two species greatly overlapped along the river, but no interbreeding occurred. M. grandis spent more time on the river than M . alba and defended territories there. M . alba used the river as part of the entire home range, and did not defend the...
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The menstrual cycle was examined in Japanese monkeys, short-day breeders, with or without nursing babies during the breeding season by determining the change in the plasma concentration of progesterone. Blood samples were obtained weekly from suckling and nonsuckling mothers for 6 months from September to February. Plasma concentrations of progesterone in suckling mothers did not show any appar...
متن کاملPolymorphisms in GDF9 Gene and Its Relationship with Litter Size in Five Breeds of Black Goats
In this study, we investigated the relationship between the genetic polymorphism of growth differentiation factor 9 (GDF9) genes and the litter size in 384 individuals of five breeds of black goats. Four pairs of primers were designed to detect single nucleotide polymorphism of GDF9 gene in goats by PCR-SSCP. The least square was used to analyze the relation between different genotypes and the ...
متن کاملRegulation of the Breeding Season in Mammals
The nature of seasonal breeding in both domestic and wild mammals has been known for centuries but only recently have we gained some insight into the mechanisms involved. Environment, encompassing climatic, nutritional, and biotic factors, plays a major role in synchronizing reproductive rhythms. Examples of the effect of environmental factors upon reproductive activity are discussed within the...
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ژورنال
عنوان ژورنال: Nihon Chikusan Gakkaiho
سال: 1984
ISSN: 1346-907X,1880-8255
DOI: 10.2508/chikusan.55.377