Estimation of Genetic Parameters for Rectal Temperature in Sows Rearing in a Tropical Humid Climate and Its Association with P
نویسنده
چکیده
The objective of this study was to evaluate the genetic parameters of thermoregulation traits and its association with sow’s performance during lactation. A total of 94 lactating Large White (LW) sows, rearing in a tropical humid climate were used in this experiment. The genetic parameters of rectal temperature measured at 0700 and 1200 (RT7 and RT12), the difference between RT12 and RT7 (dRT), sow daily feed intake during ad libitum period in lactation (DFI), the litter growth rate (LGR) and sow relative body weight loss during lactation (BWL) were estimated. The method of REML with an animal model has been used. The heritability estimates were 0.28 5 (± 0.03), 0.32 (± 0.05) and 0.49 (± 0.14) for RT7, RT12 and dRT, respectively. The genetic correlations estimated between thermoregulation traits and lactating performance characters ranged from -0.63 ± 0.13 (between RT12 and LGR) to 0.87 ± 0.42 (between dRT and BWL). These preliminary results showed the existence of genetic variability for thermoregulation suggesting that selection may change thermoregulation capacity in lactating LW sows.
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