Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(5), 113-118 | DOI: 10.11118/actaun201159050113

Effect of season and herd on rennet coagulation time and other parameters of milk technological quality in Holstein dairy cows

Gustav Chládek1, Vladimír Čejna2, Daniel Falta1, Ladislav Máchal1
1 Ústav chovu a šlechtění zvířat, Mendelova univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
2 TPK s. r. o, provoz Pribina, Oddělení vývoje a výzkumu, Hesov 421, 582 22 Přibyslav, Česká republika

In five herds of purebred Holstein dairy cows, altogether 220 bulk milk samples were collected with the following average parameters: rennet coagulation time (RCT) 265.2 sec., titratable acidity 6.40 °SH, active acidity 6.72 pH, specific density 1.0281 kg.l-1, fat content 3.81 g.100g-1, protein content 3.28 g.100g-1, lactose content 4.72 g.100g-1, and content of solids non-fat content 8.89 g.100g-1; average values of milk batch volume per herd and diurnal air temperature were 6,072 kg and 8.02 °C, respectively. It was found out that the variable "season" (spring, summer, autumn or winter) significantly influenced nearly all parameters under study (the only exceptions were values of titratable acidity and milk batch volume). As compared with all other seasons, the significantly shortest RCT was recorded in summer. Further it was also found out that the variable "herd" influenced all parameters with the exception of average diurnal air temperature. Regardless to differences existing among individual herds, the shortest average RCT was recorded always in summer.

Keywords: dairy cow, milk, composition, coagulation time, season, Holstein breed, herd
Grants and funding:

This study was subsidized by Research plan No. MSM6215648905 with title of "Biological and technological aspects of sustainability of controlled ecosystems and their adaptability to climate change", which is financed by the Ministry of Education, Youth and Sports of the Czech Republic and internal grant of Mendel University IG TP 08/2011.

Received: June 3, 2011; Published: March 23, 2014  Show citation

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Chládek, G., Čejna, V., Falta, D., & Máchal, L. (2011). Effect of season and herd on rennet coagulation time and other parameters of milk technological quality in Holstein dairy cows. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis59(5), 113-118. doi: 10.11118/actaun201159050113
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