Birth sequence and its effects on litter size
نویسندگان
چکیده
منابع مشابه
Proportion of the litter farrowed, litter size, and progesterone and estradiol effects on piglet birth intervals and stillbirths.
Stillbirth in swine ranges from 2 to 9%, resulting in a significant loss of piglets. Previous studies clearly indicate a relationship between prolonged birth intervals and stillbirth, but factors influencing birth intervals are not fully known. To characterize birth intervals and stillbirth, farrowing was recorded during three farrowing seasons. Blood samples were collected on d 110 and d 113 o...
متن کاملRelation between Birth Weight and Litter Size in Multiparous Mammals
In multiparous mammals there is a definite relation between the litter size N and the total weight of the litter W. Reasons are given showing that this relationship is independent of the mechanism of parturition. For various forms W = N(K) + const. Hence the average increment of W due to unit increase of N is directly proportional to W, inversely to N. This signifies proportionality between N a...
متن کاملMaintenance of body temperature in the neonatal lamb: effects of breed, birth weight, and litter size.
To survive, the newborn lamb must be able to maintain body temperature and to stand and move to the udder to suck colostrum to fuel heat production. The objective of this study was to investigate whether neonatal lambs showing slow behavioral progress to standing and sucking also have an impaired ability to maintain body temperature. The time taken to stand and suck after birth, rectal temperat...
متن کاملGenetic determinism for within-litter birth weight variation and its relationship with litter weight and litter size in the Ripollesa ewe breed.
Birth weight plays a central role in lamb survival and growth, and the knowledge of its genetic determinism has become essential in worldwide selection programmes. Within this context, within-litter birth weight variation (BWV) has been suggested as an attractive trait to homogenise litters in prolific species, although it has not been analysed in sheep. The objective of this study was to ascer...
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 ...
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ژورنال
عنوان ژورنال: Kansas Agricultural Experiment Station Research Reports
سال: 1982
ISSN: 2378-5977
DOI: 10.4148/2378-5977.6081