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Effect of temperature and relative humidity on the milk production of dairy cows

Imrich Ivan, Toman Róbert, Pšenková Martina, Mlyneková Eva, Kanka Tomáš, Mlynek Juraj, Pontešová Barbora

Science, Technology and Innovation

2021

Vol. 13, no. 2

22-27

The aim of this study was to evaluate the influence of environmental housing conditions on the milk yield of dairy cows. Measurements were taken in the summer period from June to September, 2020 and in the winter period during January, 2021 on a large-capacity farm of Holstein Friesian cattle. Cows were housed in free stall barn with the lying boxes and selected during the second or third lactations, in the summer period from the 51st day to the 135th day and in the winter period from the 64th day to the 120th day of lactation. The average temperature in the housing was 23°C in summer, and 7.05°C in winter. The average THI (thermal humidity index) value in summer was 70.43, but during the day the THI values sometimes reached 75. The dairy cows were therefore exposed to heat stress during summer. Increasing THI and temperature values negatively affected the milk yield, as there was a negative correlation between both THI and milk yield (r = −0.641; p < 0.01) and temperature and milk yield (r = −0.637; p < 0.01). Milk production in winter was at 58.77 kg per day and in summer at 49.55 kg per day. In the summer, the milk had a significantly lower content of fat (p < 0.05), proteins (p < 0.001), lactose (p < 0.001), minerals (p < 0.001) and conversely, a higher number of somatic cells (p < 0.01). These results show that worse environmental conditions during the summer negatively affected the level of milk yield and the composition of the cows’ milk.

Funkcjonalność obór a wydajność krów i jakość mleka

Fiedorowicz G., Muzalewski A.

Problemy Inżynierii Rolniczej

2007

R. 15, nr 3

95-102

Podano definicję funkcjonalności obory i wzór na wskaźnik funkcjonalności, według którego określono w badaniach funkcjonalność 50 obór. Obliczono zależności dotyczące wskaźników funkcjonalności i rocznej wydajności mleka oraz jego jakości. Uzyskane korelacje wskazują na istotność badanych zmiennych, potwierdzając wpływ funkcjonalności obór zarówno na wydajność krów, jak i na jakość produkowanego mleka surowego.

The functionality of a cow house was defined and a formula to calculating functionality indicator was given; on that basis the functionalities of surveyed 50 cow houses were determined. Relationships concerning functionality indicator and annual milk performance per 1 cow as well as the milk quality were determined. Obtained results indicate the significance of investigated variables and prove the impact of cow house functionality on milk performance of the cows as well as on the quality of produced raw milk.