Swine Reproduction Publications
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Breeds of Swine
It is believed that the majority of the breeds we now know are descended from the Eurasian Wild Boar (Sus scrofa).
Breeds of pigs - Landrace
The Landrace breed was developed in Denmark by first crossing the native pig with the Large White. Read more...
Breeds of pigs - Duroc
The exact origin of the Duroc breed is unknown. A number of red pig strains developed around 1800 in the United States in areas such as New York and New Jersey. Read more...
Breeds of pigs - Large White
The Large White breed of pig was developed in England in the late 1700s. Read more...
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Weaning-- Semen-- Estrus Detection-- Insemination-- Pregnancy Diagnosis-- Reproduction & Growth
Growth of Nursing Pigs and Characteristics of Nursed Mammary Gland According to the Anatomical Location
It has been suggested that the anterior mammary glands may be larger, produce more milk, or provide a more comfortable nursing position for pigs (Donald, 1937; Gill and Thomson, 1956), whereas others have suggested that there is no difference in milk production among glands (Hartman et al., 1962; Pond et al., 1962). The true advantages for pigs nursing anterior mammary glands remains uncertain.
Effect of Lowering Serum Somatoropin and Insulin-Live Growth Factor-I on Puberty and Ovulation Rate in Gilts
We are trying to understand how changes in growth and metabolism interact with ovarian function and thus overall reproductive performance. A com mon link between these two important processes is the metabolic hormones. Both growth and reproduction are affected by changes in circulating concentrations of somatotropin (ST) and insulin-like growth factor-I (IGF-I). Pigs with higher blood concentrations of ST and IGF-I because of elevated endogenous production or exogenous administration deposit more lean and less adipose tissue. What we do not clearly under stand is the effect of elevating ST and IGF-I on reproductive performance
Early Farrowing and Colostrum Formation
The physiology underlying the formation of colostrum and the development of the lactation function in the mammary gland of the sow is in close synchrony with birth of the young pig. This is necessary so that colostrum is available at the time of birth when the newborn pig is critically dependent on the colostrum. What happens when this synchrony between farrowing and colostrum formation becomes disrupted?
Production and Reproduction Responses in Boars Divergently Selected for Testosterone Levels
The production of faster growing, more efficient, leaner pigs is of primary interest in the swine industry. Boars grow faster, convert feed more effi ciently and have less fat than barrows. The higher rate of gain seen in intact males relative to castrates is related to differences in endogenous testosterone levels. Positive correlations exist between growth and blood concentrations of testosterone. The early determination of testosterone levels in addition to other criteria represents a novel approach to identify superior breeding animals.
Weaning-- Semen-- Estrus Detection-- Insemination-- Pregnancy Diagnosis-- Reproduction & Growth
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