Growth rate in thoroughbred yearlings and two year olds.

The research article investigates the growth rate of Thoroughbred yearlings and two-year-olds, detailing size measurements taken over time.

Study Overview

The study involved 104 Thoroughbred young horses, aged between 13 and 36 months. The investigators performed size measurements at regular intervals, either monthly or every two months, to document the horses’ growth. These measurements were done on different body parts and are presented separately for colts (males) and fillies (females).

Measurements Taken

• The horses’ height was measured from their hooves to their withers – the high point of a horse’s back located between the shoulder blades. This is a standard procedure in equine measurement where ‘hands’ (h) are traditionally used, with each hand being equivalent to four inches.
• Girth measurements were taken around the horses’ body behind the front legs, at the widest part of the ribcage. This measurement is commonly used to estimate a horse’s body weight.
• The circumference of the cannon bone, which is a part of a horse’s leg located just below the knee, was also recorded.

Growth Findings

The collected data revealed growth patterns in the horses. The average height of the horses at 18 months was 148 cm (or also referred to as 15.01/2 hands high). At 36 months, the average height increased to 156 cm (or 15.31/2 hands high). However, it is critical to remember that these are averages, and individual growth rates may vary. Therefore, variations in size measurements are expected among individuals.

Significance

The data presented in the study serves as an important reference for horse breeders, veterinarians, and researchers. It offers insight into the average growth rates of Thoroughbred horses during their first 3 years of life. The results can be used to assess the health and development of individual horses, to determine whether or not they are growing normally compared to the average. Potential deviations might highlight health issues or indicate differences in care or nutrition that could be adjusted to ensure optimal growth.