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Research Paper | Animal Science | Turkey | Volume 12 Issue 7, July 2023
The Relationships between the Color of the Nose Area with Milk Yield, Physiological and Blood Paremeters of Holstein Cows in Hot and Humid Conditions
Ozgul ANITAS [2] | Serap GONCU [4]
Abstract: The objective of this research was to investigate the correlation between the color of the nasal region and the milk yield, physiological responses, and hematological parameters in Holstein cows under hot and humid conditions. Data were gathered during morning, noon, and evening periods in July, with an average temperature-humidity index of 82 units. Cows with a white nasal region exhibited lower respiration rates breaths per minute during the morning 67.27, 81.53 compared to those with a black nasal region, but higher rates during the noon 96.13, 95.13 and evening 99.33, 98.53 periods. The difference in morning respiration rates between cows with black and white nasal regions was statistically significant p < 0.05. Heart rate beats per minute was lower in cows with a black nasal region compared to those with a white nasal region during the morning 69.67, 71.13 and noon 87.27, 90.93 periods, but higher in the evening 88.87, 87.80. the rectal temperature in cows with a black nasal region was 0.14 C higher in the morning and 0.20 C lower at noon compared to cows with a white nasal region. The 305-day milk yield was higher in cows with a white nasal region compared to those with a black nasal region, although this difference was not statistically significant p > 0.05. However, the average weekly milk yield kg during the trial period was significantly higher p < 0.05 in cows with a white nasal region. While the levels of magnesium mg/dL, iron ?g/dL, sodium mmol / L, potassium mmol / L, and calcium mg / dL were higher in cows with a black nasal region, these differences were not statistically significant p > 0.05. The study concluded that the average daily milk yield during summer was 21.18?3.68 kg in cows with a white nasal region and 15.02?2.93 kg in cows with a black nasal region, indicating that cows with a white nasal region produced an average of 6 kg more milk per day. Furthermore, physiological data suggested that cows with a white nasal region were better equipped to cope with daytime heat stress during the cooler night hours, which was also reflected in their hematological values.
Keywords: Nose Area Color, Milk Yield, Blood Metabolites, THI
Edition: Volume 12 Issue 7, July 2023,
Pages: 1835 - 1841