La raza Guernsey: su potencial en sistemas lecheros en Uruguay y el camino a recorrer para su importación

The objective of this work is to generate a general knowledge of the Guernsey breed through results published in different parts of the world where the breed is found. The comparison made with different dairy breeds has the objective of showing the potential of the breed under study in comparison with the others, but especially with the Holstein breed, the main Uruguayan dairy breed.

The milk of this breed is characterized by having high values -in percentage- of fat and protein, and the content of beta casein A2, with proven benefits for human health. On the other hand, other properties characterize it, such as the content of beta carotenes, which generate better aroma and golden color in the milk, being this product called "golden milk".

In terms of published results, under similar production conditions, no significant differences are observed with respect to age at first calving and calving intervals with respect to Holstein. However, a higher efficiency in terms of grain consumption per liter of milk produced is observed in Guernsey compared to Holstein.

Other traits, such as those associated with the adaptability and docility of these animals, make it interesting and with favorable perspectives if it were used in our pastoral dairy production systems.

This work also sought to generate a guide with basic knowledge regarding the importation of ova, semen and embryos for those interested in the inclusion of new genetic resources in our country.

However, it is necessary to take into account that the knowledge of the real productivity of a genetic resource can only be known through studies that include the breed in the country, being this aspect known as genotype x environment interaction.

Given the productive and behavioral characteristics of the Guernsey breed, as well as the quality of the milk produced, it can constitute a very promising alternative in our pastoral dairy production systems.