SUCKLING PERIOD AND MILK PRODUCTIVITY OF THE SHEEP FROM BULGARIAN DAIRY SYNTHETIC POPULATION
Nevyana Stancheva, Jivko Krastanov, Teodora Angelova, Georgi Kalaydzhiev, Daniela Yordanova
Agricultural Institute, 9700 Shumen, Bulgaria
nevqna_68@abv.bg
The aim of the study was to determine the influence of suckling period on milk production of sheep from Bulgarian Dairy Synthetic Population (BDSP) grown in the Еxperimental base of the Agricultural Institute in Shumen. Total 5023 record are analyzed for milk yield for monthly control days of 601 ewes (born 2007th – 2012th years) produced from 1 to 6 lactations. To achieve unbiased evaluation was used animal model for test day. The statistical analysis included the following factors: month of the controls, consecutive lactation, age in days to the date of the control day, days suckling period and the number of lambs for the relevant lactation of the animal. The results show that the duration of the suckling period influences the milk productivity of sheep from BDSP. In ewes with suckling period of lambs exceeding 30 days, production of milk progressively decreases from 0.911 liters to 0.554 liters (–0.357) at suckling period of 80 – 90 days. Improving the management of the flock towards reducing the suckling period can lead to a significant increase in milk production.
Keywords: sheep; Bulgarian Dairy Synthetic Population; milk productivity; suckling period; test-day modelovi
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