Efecto de la fuente y nivel de zinc en el comportamiento productivo de machos no castrados (40-110 kg) y su relación con el comportamiento sexual

Résumé

The use of sources of Zn (organic and inorganic) in feed for pigs prepubertal has proved essential, because this mineral has shown aspects related to reproductive, immune response, health, weight gain, feed consumption benefits. Early studies identified the Zn as an essential component in the reproduction were in the decade of the 40s, where the importance of this mineral was established in the development of Leydig cells, from the use of these findings is recommended ore in feed for pigs. However, the recommendations that have been made to support the effect of Zn on reproduction were identified 30 years ago, and little has been studied since about the level of Zn to be included in the feed. Moreover, the animal feed industry has it developed mineral springs with higher bioavailability, first for the body to use more quickly and efficiently (> bioavailability) and partly to prevent the ore consumed by the animal, be lost through droppings, thus ensuring not only the reduction of economic losses, but minimizing the environmental impact negatively Zn exercised. Thus, it was decided to conduct research that provides information on the effect of sources and levels of Zn in growth efficiency and development of prepubertal pigs and young boars in the development of the testes and their cell structures and in the sexual behavior of young boars. For the previous 50 pigs Landrace x York genetic line were used, with an initial average weight of 35 ± 1.25, these animals were distributed in seven treatments, which corresponded to diets formulated with and without the addition of a source of Zn (ZnSO4, ZnO, ZnMet), and two levels (150ppm and 200ppm Zn). The basal diet was formulated using the table of nutritional needs FEDNA (2006). All pigs were placed in individual cages, with single trough and trough. They were given an adjustment period of 15 days, then the experimental phase where feed intake (CDP) was measured, feed conversion (CA), weight gain (GDP), was launched at the end of the breeding period (Growth, Development and Finishing pigs) and pigs reached a weight greater than 100 kg, three pigs, of which the testes, epididymis, spleen, pancreas, bone (femur), liver and kidneys were obtained were sacrificed to analyze through Atomic absorption spectrophotometry the concentration of Zn ...