The impact of somatic cell count on milk yield and composition

摘要

Article Details: Received: 2020-10-15 | Accepted: 2020-11-27 | Available online: 2021-01-31 https://doi.org/10.15414/afz.2021.24.mi-prap.49-52 The aim of this work was to clarify impact of somatic cell count (SCC) on milk yield and its composition. The experiment was realized on one dairy farm with Tsigai breed. Totally 252 milk samples from 84 ewes (on their first and second lactation) were analysed. Milk samples within regular test recording day from the whole udder were collected during lactation in April, June and July. On the basis of SCC the samples were divided into the SCC groups: first <200 × 10 3 cells.ml -1 ; second ≥200 <400 × 10 3 cells.ml -1 ; third ≥400 <600 × 10 3 cells.ml -1 ; fourth ≥600 <1000 × 10 3 cells.ml -1 ; fifth ≥1000 × 10 3 cells.ml -1 to see the effect of SCC at the level of regular milk recording test day. The same SCC groups were used for distribution of the lactation means of somatic cell score (SCS) for evaluation of the effect of SCC at the level of whole lactation. Total milk yield per lactation was affected SCS per lactation ( P =0.0089). In each month of sampling we observed decrease content of lactose at the level of test day ( P <0.001) and at the level of lactation ( P =0.001) with increase of SCC. The increase content of protein we detected with increase of SCC at the level of test days ( P =0.0281) and decline per lactation ( P =0.0452). In content of fat we did not find out change in relation with increase of SCC in regular milk recording test days and per lactation also. The analyses suggest that SCC negatively impact on milk yield and milk composition and SCC should be in high attention of dairy practice. Keywords: somatic cell count, milk yield, milk composition References Albenzio, M., Caroprese, M., Santillo, A., Marino R., Taili, L. Sevi, A. 2004. Effect of somatic cell count and stage of lactation on the plasmin activity and cheese-making properties of ewe milk. Journal of Dairy Science , 87(3), 533-542. https://doi.org/10.3168/jds.S0022-0302(04)73194-X Arias, R., Oliete, B., Ramón, M., Arias, C., Gallego, R., Montoro, V., Gonzalo, C., Pérez-Guzmán, M. D. (2012). Long-term study of environmental effects on test- day somatic cell count and milk yield in Manchega sheep. Small Ruminant Research , 106(2-3), 92-97. DOI: http://dx.doi.org/10.1016/j.smallrumres.2012.03.019 Baranovič, Š., Tančin, V., Tvarožková, K., Uhrinčat, M., Mačuhová, L., Palkovič, J. 2018. Impact of somatic cell count and lameness on the production and composition of ewe´s milk. Potravinarstvo Slovak Journal of Food Sciences , 12(1), 116-121. DOI: https://doi.org/10.5219/900 Cuccuru, C., Meloni, M., Sala, E., Scaccabarozzi, L., Locatelli, C., Moroni, P., Bronzo, V. (2011). Effect of intramammary infections on somatic cell score and milk yield in Sarda sheep. New Zealand Veterinary Journal , 59(3), 128-131. DOI: https://doi.org/10.1080/00480169.2011.562862 Kuchtík, J., Konečná, L., Sýkora, V., Šustová, K., Fajman, M., Kos, I. (2017). Changes of physico-chemical characteristics, somatic cell count and curd quality during lactation and their relationships in Lacaune ewes. Mljekarstvo , 67(2), 138-145. DOI: 10.15567/mljekarstvo.2017.0206 Leitner, G., Silanikove, N., Merin, U. (2008). Estimate of milk and curd yield loss of sheep and goats with intrammamary infection and its relation to somatic cell count. Small Ruminant Research, 74(1-3), 221-225. DOI: http://dx.doi.org/10.1016/j.smallrumres.2007.02.009 Lusis, I., Antane, V., Laurs, A. (2010). Effectiveness of static cell count determinetion in the milking robots. Proceedings of 9th International Scientific Conference Engineering for Rural Development , 112-116. Margetín, M., Milerksi, M., Apolen, D., Čapistrák, A., Oravcová, M., Debrecéni, O. (2013). Relationships between production quality of milk and udder health status of ewes during machine milking. Journal of Central European Agriculture , 14(1), 328-340. DOI: https://doi.org/10.5513/JCEA01/14.1.1