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[Objective] The present experiment aimed to investigate the difference of the reproductive performances of Saba and its hybrid sows with different dietary crude fiber levels. [Method] Pregnant sows of parity 2 to 6 of 180 Saba (SB), 90 Duroc x Saba (DS) and 90 Landrace x Saba (LS) were selected for experiment. The sows of the same breed or hybridized combination were randomly divided into 3 groups according to the initial conditions of the sow's family, parity and historical reproductive performance. During the pregnancy and lactation periods, the 3 groups sows were fed different diets with 3.5%, 6.5% and 9.5% crude fiber (CF) levels, respectively. The differences of 11 reproductive performance indexes among 3 groups were analyzed by least square model. [Result] When the dietary crude fiber levels increased from 3.5% to 6.5% and 9.5%, the farrowing progress (FP) of SB sows were significantly shortened by 15.97 min (P<0.05) and 26.64 min (P<0.05), the FP of DS sows were significantly shortened by 10.94 min (P<0.05) and 9.60 min (P<0.05), and the FP of LS sows were significantly shortened by 59. 36 min (P<0.05) and 24. 82 min (P<0.05), respectively. However, there was no significant difference between the sow FP with the dietary crude fiber levels of 6.5% and 9.5% (P>0.05). The litter weight at 21 days (LW21D) of piglets of SB sows significantly increased by 3.75 kg (P<0.05) and 4.49 kg (P<0.01); The number of piglets at 21 days of the DS sows significantly increased by 1. 16 (P<0.05) and 2.06 (P<0.05), LW21D increased by 6. 28 kg (P<0.05) and 15.30 kg (P<0.01), number weaned increased by 1. 12 and 1.88 (P<0.05), and litter weight at weaning (LWW) increased by 11.55 and 19.57 kg (P<0.05); The LW21D of LS sows significantly increased by 8.78 kg (P<0.05) and 10.64 kg (P<0.01), and LWW increased by 8.78 and 14.87 kg (P<0.05), respectively. [Conclusion] The results of the study indicated that the sows of SB, DS and LS had good resistances to crude feed. For different pig breeds (hybridized combinations), the high level of crude fiber diet could improve the nursing performance of DS and LS sows more than that of DS sows. The reproductive performance of SB, DS and LS sows was not reduced but improved when fed with a moderate high crude fiber diet. [ABSTRACT FROM AUTHOR]

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[Objective]In order to optimize parity structure and mating time of pig population, the effects of parity and mating season on gestation length and litter performance were studied. [Method]A reproductive record of total 3278 parities in 2016-2017 years for American Large White Sows from breeding pig faom of Yunnan Huijia Breeding Company Limited was analyzed. [Result] The breeding season had significant effect on the total litter size, the number of live litters（P <0.05）. The total number born and number born alive of sows in spring were significantly higher than those in summer and autumn（P <0.05）. It had significant difference under different parities for the total number born number born alive number of stillbirths, gestation period and so on（P<0.05）. The litter performance of the 3rd-5th parities and the 7th parity was better than that of other parities. [Conclusion] The best reproductive performance of the American White Sows is the 3rd, 4th, 5th and 7th parities, and the mating performance of sows in spring is better than that in other seasons. [ABSTRACT FROM AUTHOR]