SciELO - Scientific Electronic Library Online

 
vol.50 issue1The densities of fiber follicles in the Karakaç, Norduz, and Zom sheep and a comparative analysisProbiotics on performance, intestinal morphology and carcass characteristics of broiler chickens raised with lower or higher environmental challenge author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Austral journal of veterinary sciences

Print version ISSN 0719-8000On-line version ISSN 0719-8132

Abstract

MELLADO, Miguel et al. Effect of climate and insemination technique on reproductive performance of gilts and sows in a subtropical zone of Mexico. Austral j. vet. sci. [online]. 2018, vol.50, n.1, pp.27-34. ISSN 0719-8000.  http://dx.doi.org/10.4067/S0719-81322018000100106.

The objective of this study was to analyse the reproductive performance of hybrid (Yorkshire x Landrace) gilts/ sows in relation to temperature-humidity index (THI) at artificial insemination (AI), season of AI, occurrence of estrus >8 d post- weaning, repeated estrus, insemination technique (cervical, CAI or post-cervical, PCAI) and parity. Data included 8851 reproductive records (1771 for gilts and 7080 for sows) from a pig farm in a sub-tropical zone (THI ranged from 72.9 in January to 81.8 in June). A decrease in pregnancy rate (PR, 89.8 vs 93.0%; P<0.01) and a tendency to decline farrowing rate (FR, 87.9 vs 90.3%; P=0.07) following AI during high THI (>82), compared to AI at <74 THI were observed. The spring and summer season were associated with decreased (P<0.01) PR compared with fall and winter (90.0% vs 93.0%). Likewise, FR decreased in spring and summer compared to fall and winter (88.5% vs. 90.9%). FR was higher (P<0.01) in non-repeat breeders compared with that of repeat-breeders (90.3% vs 76.2%). Litter size increased (P<0.01) from 10.8 ± 3.2 to 11.1 ± 3.1 pigs when the interval from weaning to estrus was >8 d. The insemination technique did not affect PR and FR but the litter size decreased (P<0.05) from 11.3 ± 3.0 to 11.1 ± 2.9 pigs when PCAI was used compared to CAI. This study reaffirms the negative effects of the hot season on reproductive performance of gilts/sows, although thermal stress at AI did not cause foetal losses. Also, there is no advantage in using the PCAI as compared to the CAI in gilts/sows with high numbers of sperm cells per AI.

Keywords : sows; seasonal infertility; litter size; stillborn piglets; temperature-humidity index.

        · text in English     · English ( pdf )