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Sammanfattning

The aim of this study was to investigate the variation in temperature and humidity during a 12-month period in boar stables in Thailand with either conventional open air system (CONV) or evaporative cooling system (EVAP), as well as the effect of season, temperature, humidity, age of the boar, and semen collection interval on sperm production in Duroc boars kept in these stables. Ejaculates were collected from sexually mature Duroc boars in six CONV herds and five EVAP herds during a 1-year period. A total of 15,630 semen records were included in the statistical analyses. Temperature was higher and humidity was lower in the CONV system compared to the EVAP system. Twenty-one days moving-average of daily maximum temperature and minimum humidity with 7 and 14 days lag time was calculated and merged with each semen record. Besides the fixed effects included in the statistical models, the random effects of herd and boar within herd were included. No significant effect of system on volume of the ejaculate and total sperm production (TSP) was found, but there was a significant effect of month, age of the boar and collection interval on both volume and TSP (P

Nyckelord

Boar; Housing system; Sperm production; Season; Temperature; Humididy; Age; Collection interval

Publicerad i

Livestock Production Science
2004, volym: 89, nummer: 1, sidor: 19-31
Utgivare: ELSEVIER SCIENCE BV

SLU författare

UKÄ forskningsämne

Veterinärmedicin
Husdjursvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1016/j.livprodsci.2003.12.008

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/3757