Comparative feed efficiency of Holstein and Jersey cows

Area of Science:

• Animal Science
• Dairy Nutrition
• Reproductive Physiology

Background:

• Feed efficiency is crucial for dairy production economics.
• Understanding breed-specific nutrient utilization aids in ration formulation.
• Holstein and Jersey breeds are prominent in global dairy industries.

Purpose of the Study:

• To compare feed efficiency between Holstein and Jersey cows.
• To evaluate breed differences in energy and nitrogen utilization during lactation.
• To determine if breed impacts the conversion of dietary nutrients to milk components.

Main Methods:

• Nitrogen balance trials were conducted on Holstein and Jersey cows.
• Cows were fed ad libitum corn silage-based diets.
• Feed efficiency, nutrient utilization, and apparent digestibilities were measured in early lactation.

Main Results:

• No significant differences in dry matter or nitrogen digestibility between breeds.
• Similar conversion rates of dietary protein to milk protein.
• Holstein cows exhibited higher energy utilization efficiency than Jersey cows in the second trimester of lactation.

Conclusions:

• Holstein cows demonstrate a potential advantage in energy conversion efficiency during later lactation stages.
• Jersey cows may prioritize adipose tissue repletion, indicated by increased dry matter intake and nitrogen balance.
• No overall comparative advantage for Jersey cows in feed efficiency despite different physiological responses.