Produkcia a zlozenie mlieka krizeniek cigaja x suffolk pocas dojnej periody.
1996
Margetin M. | Kalis M. | Capistrak A. | Spanik J.
The aim of this work was to evaluate the milk efficiency of Tsigai x Suffolk crosses (TXSf) of F1 generation kept in identical conditions as the pure-bred Tsigai sheep (T). The control measurements of milk (CMM) were performed after the weaning of lambs from sheep in 1st to 3rd lactations in 1993-1995 in line with international regulations for milk recording in sheep issued by ICAR in 1992. 5 CMM yearly were performed during the milking period, namely in the evening and in the morning. Milk samples for the determination of the main components (fat, proteins, lactose) were taken from the morning CMM and analysed in the Multispec apparatus. Variance analysis was used for the evaluation. The average daily production and total milk production was 470.1 ml and 63.1 l in T and 485.0 and 66.9 l in TxSf crosses over a 136 day milking period. The milk production during standardized 150 day lactation was 70.5 l in T, 72.7 l in T x Sf. Differences in milk production between the genotypes were statistically nonsignificant. Nonsignificant differences were observed also when the total production of fat, proteins, and dry matter was compared for the whole 136 days milking period. The average content of fat, proteins, lactose, dry matter and fat-free dry matter was in the populations of ewes 8.16 %, 5.70 %, 4.58 %, 19.34 % and 11.18 %. The differences were nonsignificant when the genotypes were compared, with the exception of protein content (P less than 0.1) and fat-free dry matter (P less than 0.001) on behalf of pure-bred T ewes. The lactation order influenced the content of proteins and lactose significantly (P less than 0.001).
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