Original scientific paper

https://doi.org/10.24099/vet.arhiv.0168

The effects of somatic cell count on milk yield and milk composition in Holstein cows

Ertuğrul Kul ; Department of Animal Science, Faculty of Agriculture, University of Kırşehir Ahi Evran, Kırşehir, Turkey
Aziz Şahin ; Department of Animal Science, Faculty of Agriculture, University of Kırşehir Ahi Evran, Kırşehir, Turkey
Savaş Atasever ; Department of Animal Science, Faculty of Agriculture, University of Ondokuz Mayis, Samsun, Turkey
Emre Uğurlutepe ; Department of Animal Science, Faculty of Agriculture, University of Kırşehir Ahi Evran, Kırşehir, Turkey
Mustafa Soydaner ; Department of Animal Science, Faculty of Agriculture, University of Kırşehir Ahi Evran, Kırşehir, Turkey

Abstract

This study was conducted to assess the impact of somatic cell count (SCC) on the test day milk yield (TDMY) and milk composition parameters (fat, solids-not-fat, protein and lactose) of Holstein cows raised in the Kırşehir province of Turkey. A total of 1194 raw milk samples were collected from 195 Holstein cows at different stages of lactation (from 1 to 7), parities (from 1 to 3) and calving seasons (autumn, winter, spring and summer). Also, TDMY and milk composition traits were tested by SCC in four groups (<100×103, 100-200×103, 201-500×103 and >500×103 cells/mL). For statistical evaluation, SCC data were converted to log10 base. The overall means of log10SCC, TDMY, fat, solids-not-fat (SNF), protein and lactose were determined as 4.95 ± 0.016, 33.36 ± 0.232 kg/day, 3.39 ± 0.021%, 9.04 ± 0.013%, 3.32 ± 0.005% and 4.92 ± 0.007%, respectively. Log10SCC, TDMY, fat, SNF, protein and lactose were significantly affected by the stage of lactation, parity and calving seasons (P<0.05). An increase in the SCC was accompanied by a decrease in the milk yield as well as its content (P<0.05). Cows’ milk with high SCC (>201×103 cells/mL) had a lower TDMY than milk with lower SCC (<100×103 and 100-200 cells/mL). However, the lowest fat, SNF, protein and lactose were determined in milk with SCC >500×103 cells/mL. It was concluded that SCC in milk should not exceed 500×103 cells/mL for Holstein cows, suggesting that monthly control of SCC may be effective for improving milk production and milk quality in Holstein cows.

Keywords

Holstein cow; somatic cell count; milk production; milk fat; milk protein; lactose

Hrčak ID:

219932

URI

https://hrcak.srce.hr/219932

Publication date:

15.4.2019.

Article data in other languages: croatian

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