COMPARATIVE STUDY ON MILK PRODUKTION FIRST LACTATION AND PRODUKTIVE LONGEVITY OF THE DAUGHTER OF DIFFERENT COWS SIMENTALSKI BULLS | Сравнително проучване върху млечната продуктевност на първа лактация и продуктивното дълголетие на крави дъщери на различни Сименталски бикове
2010
Stojkov, P.., Experimental Station of Agriculture, Vidin (Bulgaria) | Gajdarska, V., Institute of Animal Science, Kostinbrod (Bulgaria) | Momchilova, L., Experimental Station of Agriculture, Vidin (Bulgaria) | Kharizanova, Ts., Institute of Animal Science, Kostinbrod (Bulgaria)
The aim of the study is to examine the impact of milk productivity on first lactation cows productive longevity of daughters of bulls from different breeds Simentalskata acted in the station. In this connection, the data were processed on milk production and fertility of 749 cows, 8 bulls daughters acted in the herd. It was found that the highest milk production of first lactation were daughters of a bull made Darina mlechnost 3348kg, followed by those of bulls Primus, Disco, Six and Ami realized respectively by 3307: 3132: 3068 and 2964kg. In their most high mlechnost and life, namely the daughters of a bull Ami 14180kg, and for those of Darius, Disco, Six and 13 600 respectively Primus: 12920: 12120 and 11500kg. It was found that the highest milk production of first lactation were daughters of a bull made Darino mlechnost 3348kg, followed by those of bulls Primus, Disco, Six and Ami realized respectively by 3307: 3132: 3068 and 2964kg. In their most high mlechnost and life, namely the daughters of a bull Ami 14180kg, and for those of Darino, Disco, Six and Primus respectively 13 600 : 12,920 : 12120 and 11500kg. Productive longevity, ie the number of calves produced was again the most to them as the daughters of Darino bull calves were 5.29, Disco - 4.70: Six - 4.66 and Ami 4.54 number. The lowest figures are found in cows, daughters of a bull Proper. Milk production at first lactation is 2089kg., lifetime milk yield 2751kg, received a number of calves is 1.93. From the results it is clear that achieved good milk production at first lactation did not influence negatively the productive longevity of cows used.
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