l] is random additive genetic value of individual (l = 1 to 23,724 for Tsigai, 1 to 51,401 for Improved Valachian and 1 to 438 for Lacaune) with a relationship matrix incorporated
li] is random permanent environmental effect common for all test days within lactation for each ewe with data (26,344 levels for Tsigai, 53,681 levels for Improved Valachian and 562 levels for Lacaune)
With Tsigai and Improved Valachian, a research study on estimates of covariance components was previously published (see Oravcova et al.
The distribution of annual genetic and phenotypic changes for 150-day milk yield, fat and protein content for Tsigai and Improved Valachian ewes born in 1995-2003 and Lacaune ewes born in 1997-2003 is given in Tables 2, 3 and 4.
The cumulative phenotypic changes were about 6, 4 and 15 kg for Tsigai, Improved Valachian and Lacaune 150-day milk yield.
With genetic trends, no genetic response was found until 1997 and 1998 for Tsigai and Improved Valachian 150-day milk yield.
The phenotypic values for 150-day milk yield for Tsigai and Improved Valachian were mostly lower than phenotypic values for standardized milk yield reported by Moili and Pilla (1994), Ugarte et al.
These findings were in accordance with our findingins for Tsigai and Improved Valachian, as both breeds showed the higher genetic responses during the recent years.