The aim of this work was evaluation of milk yield and fertility of cows´ groups, which were formed on the basis of milk production quantity, age, a calving season, pedigree, body framework of cattle and a level of body condition. There were evaluated results at 690 cows in years from 2004 to 2007. The foundation dates about the yield and the fertility of animals were abtoined by check of the yield. The body framework of cattle and condition were investigated with regular month intervals during the year 2007. Body condition was considered in an interval from 1 to 5 points with accuracy of 0,25 point. During the watching years milk yield increased from 6 616 kg to 8 507 kg. Milk components reduced with increasing milk yield, when the contents of fat was gradually reduced from initial 4,2 % to 3,87 %. The contens of proteins was also reduced from 3,5 % to 3,37 %. It was investigated that the decline of body condition after calving was connected with extension of insemination interval and service period by six days and its increase with shortening of interval and SP by four days. The higher milk yield (8 281 kg) but at the same time longer service period was investigated with cows of bigger body framework (the hight in back from 145 to 150 cm). During the evaluation of effect breeding groups (C1, C2, C3) to fertility weren´t investigated more important differences among the groups. But the breeding groups influence the hight of milk yield, ehen the C3 group (share of dairy breed more than 50 %) has the highest milk yield (7 866 kg). The highest milk yield was investigated with cows at the second lactation period (7 900 kg), at the third lactation period was almost on the same level (7 886 kg)and in the following lactation periods the quantity of milk gradually fell down. The examination of lactation curve courses at cows´ group with a different level of yield indicated , thet the higher care in a herd is devoted to milk production than to cows´ fertility. The length of service period at the highyield cows was as 200 days.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:47286 |
| Date | January 2008 |
| Creators | ZADÁKOVÁ, Martina |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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