The cycle index, an alternative to the farrowing index converted to a yearly basis

The farrowing index is an important parameter for the evaluation of sow productivity. The value of the farrowing index calculated over a relatively short period of time and converted to a yearly basis, depends largely on the number of litters produced during this period. Random differences in the nu...

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Bibliographic Details
Published inThe Veterinary quarterly Vol. 8; no. 1; p. 40
Main Authors Wierda, A, van der Valk, P C, Vernooy, J C, Buurman, J, Vandenbooren, J C
Format Journal Article
LanguageEnglish
Published England 01.01.1986
Subjects
Animals
Breeding
Female
Pregnancy
Reproduction
Swine - physiology
Time Factors
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Summary:The farrowing index is an important parameter for the evaluation of sow productivity. The value of the farrowing index calculated over a relatively short period of time and converted to a yearly basis, depends largely on the number of litters produced during this period. Random differences in the numbers of litters produced in subsequent periods will strongly influence the farrowing indices of these periods. The cycle index is designed to obtain a more valuable and consistent parameter. The cycle index is based on reproductive data of sows that farrowed during a certain period and the number of production days lost because of culling of sows during that period.
ISSN:0165-2176
DOI:10.1080/01652176.1986.9694016