Research on the genetic structure and morphological and productive potential of the Grey Steppe.

The current state of the problem concerning the cattle preservation of the breeds in danger of extinction determines us to continue these studies and to finding the most modern and efficient preservation methods of these valuable resources in the genetic fond, represented by Grey Steppe breed. So this paper wants to have a small contribution to knowledge of morphological and productive potential and genetic structure of this breed in order to maintain the specific features and continue of conservation work of Grey Steppe breed. Nucleus of Grey Steppe breed that is in genetic conservation at SCDCB Dancu is divided into 10 genetic groups. Overall analysis of the value of improvement for the amount of milk Grey Steppe breed bulls used for breeding shows that 4 of 9 bulls are enhancers studied for this purpose (with positive values between 6.87 and 178.71 kg), a bull is indifferent (0 12 kg) and 4 are worsened for quantitative milk production (negative values between -59.14 and -101.93 kg). Breeding value for morphology, respectively for the height at the withers of the Grey Steppe breed bulls used for breeding indicates that 4 of the 9 bulls are enhancers studied for this purpose (with positive values between 0.74 and 2.88 cm), an indifferent bulls (0.18 cm) and 4 worsened for height at the withers (negative values between -1.10 and -2.62 cm). Regarding weight of the Grey Steppe breed bulls used for breeding analysis shows that 6 of 9 bulls are enhancers studied for this purpose (with positive values between 3.99 and 19.15 kg) and 3 worsened for (negative values between -2.75 and -48.72 kg). Potential breeding value of the nucleus of the Grey Steppe breed from SCDCB Dancu is 2048.59 kg for the amount of milk and 4.59% for fat content , which shows the potential of this breed decreased for all analyzed morpho-productive. Also for the main morphological indicators analyzed potential improvement value shows: height at withers: 123.73 cm, chest area: 183.65 cm, horizontal length of the trunk: 152.34, while the weight is 513 kg for breeding value.