The litter size increases as the ovulation rate increases, but the ovulation rate is influenced by the age of the sow, nutritional level of the sow, for the environment and the genetics among others. It is also influenced by the size of the uterus, that is to say, while the ovulation rate is increased it is increased the losses of ova. This square was published:
it appraises size mort. nac. mort. lech. losses
ovulation litter prenatal alive neonatal dest. %
<10 6.8 25.3 6.7 1.5 6.5 35
11-12 9.2 20.7 8.8 4.3 8.4 30
13-14 9.5 30.2 9.2 3.2 8.9 36.4
15-16 10.3 32.8 10.1 1.9 9.9 38
17-18 10.3 41.5 9.9 3.9 9.5 47.1
19-20 11 42.1 10.5 4.6 10.0 50
Another variable to consider is that the production of pigs a year is affected by the days of nursing. The selection programs have diminished the thickness of fat, joined to the excellent nutritious efficiency and the meager growth, it has increased the maturation of the corporal size, giving a poor litter as a result, it gets off milky production and a reduction in the time of productive life of the sow. For exposed the above-mentioned, I have always pointed out them that they don't make experiments to reduce the cost of the food. What should be made is to maximize the handling, taking into account the genetics to select, to minimize the changes of corporal weight, to reduce the estrés of the sow during the first month postservicio, estros detection, to determine the time of nursing that should be taken in the exploitation without affecting the productive efficiency, to determine which the loss of weight is in nursing, as well as the thickness of fat dorsal and possible seasonal effects.
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