Devising and validating a pen-side hematological formula for hemoglobin estimation in Cholistani cattle

Area of Science:

• Veterinary Hematology
• Animal Science
• Ruminant Physiology

Background:

• Accurate hemoglobin (Hb) estimation is crucial for cattle health assessment.
• Current methods for Hb estimation in Cholistani cattle are limited.
• The study investigates the applicability of human medicine's packed cell volume (PCV) to Hb ratio in cattle.

Purpose of the Study:

• To develop a pen-side hematological formula for estimating Hb from PCV in Cholistani cattle.
• To validate the conventional human medicine rule (Hb = 1/3 PCV) for Cholistani cattle.
• To establish a reliable method for Hb estimation in this specific cattle breed.

Main Methods:

• Collected blood samples from 364 Cholistani cattle.
• Determined PCV using the microhematocrit method.
• Measured Hb concentration using a hematology analyzer (HbD) and calculated it (HbC = 1/3 PCV).
• Applied independent-sample t-tests and linear regression analysis to compare Hb values and establish correlations.

Main Results:

• A significant positive correlation (r=0.893) was found between HbD and PCV, and between HbD and HbC in adult female stock.
• A regression equation, Hb (g/dL) = 0.13 (PCV) + 6.3, was derived for Hb estimation from PCV.
• No significant difference was observed between directly measured Hb (HbD) and corrected Hb (CHb) derived from the new equation.

Conclusions:

• The human medicine convention of Hb being one-third of PCV is not applicable to Cholistani cattle.
• The derived equation Hb (g/dL) = 0.13 (PCV) + 6.3 provides a reliable method for estimating Hb from PCV in Cholistani cattle.
• This new formula can aid in practical, on-farm health monitoring of Cholistani cattle.