What kind of sow should the farmer keep for breeding? Pig technology tells you
I. Evaluation from the performance of breeds (strains) and individual traits of sows
For sow breed (strain) performance requirements, in addition to the standard lean meat pigs, rapid growth and development, but also pay attention to its reproductive performance and adaptability to local feeding conditions. In this regard, domestic cultivars have obvious advantages, mainly as follows:
1, more litter size;
2, sexual maturity is early, obvious estrus symptoms, such as downtown circles, climbing fences, crawling across the same column of pigs and red and swollen pubs than the introduction of species is obvious, very convenient for the production of estrus identification and timely breeding. Can reduce the leakage and increase reproductive efficiency;
3, resistance to rough feeding, strong adaptability, this feature is very important for many farmers with relatively simple farming conditions, in our country there are many good introduced varieties due to the lack of this, the results of a serious decline in production performance .
Second, from the sow physical appearance and related traits for comprehensive assessment and selection
1. There should be no obvious defects in the external genitalia of the sow, such as the narrow or upturn of the vulva;
2. The number of teats is usually no less than 7 pairs, the nipples are evenly spaced, the teat is well developed, and there are no nipples such as teat nipples, inverted nipples and deputy nipples;
3, good health, good structure development, rapid growth, to prevent small pigs, no limbs disease, walking easily;
4, early stage of the early period, generally no more than 6 months of age;
5, irresponsive gilts are not suitable for seeding;
6. Those who have conditions may use genealogical data to conduct genetic assessment of their main production performance based on the production performance of parents and siblings, such as reproduction performance.
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