What question did this study set out to answer?

To assess the effects of diet composition, dietary transition timing, and feeding systems on milk production and reproductive efficiency in dairy cows grouped by parity and potential yield.

April 1, 1987The Journal of Agricultural Science

Grouping and complete diet composition in relation to parity and potential yield in dairy cows

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Authors

OKO. KrollHachaklait (Israel)JOJ. B. OwenUniversity College of the North CWChris WhitakerBangor University

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Implication

Feeding trial demonstrates that uniform complete diets optimize reproduction and yield across parity in dairy cows, suggesting simplified nutritional management.

Key Points

To assess the effects of diet composition, dietary transition timing, and feeding systems on milk production and reproductive efficiency in dairy cows grouped by parity and potential yield.
Conducted three feeding trials in a total of 294 Israeli Holstein cows.
Experiment 1 (n=40) evaluated dietary energy step-downs (high to medium energy) at 60 versus 180 days post-calving.
Experiments 2 (n=64) and 3 (n=190) compared a continuous uniform diet (25:75 forage-to-concentrate dry matter ratio) against a step-down feeding system (transitioning to 35:65 at approximately 74 days).
Dietary step-downs initiated at 180 days post-calving induced a greater reduction in milk and fat-corrected milk yield than changes initiated at 60 days post-calving.
Yield outcomes were governed predominantly by individual potential yield rather than feeding strategy, indicating that lower-energy diets can be used without efficiency loss.
Cows managed under the uniform diet regimen achieved a shorter calving-to-conception interval compared to those in the stepped feeding system.

Cite This Study

Kroll et al. (1987) studied this question.

synapsesocial.com/papers/6a828fbbd8c35e1a1e239d1e https://doi.org/10.1017/s0021859600079272

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Implication

Feeding trial demonstrates that uniform complete diets optimize reproduction and yield across parity in dairy cows, suggesting simplified nutritional management.

Grouping and complete diet composition in relation to parity and potential yield in dairy cows

Discussion

Member takes

Implication

Key Points

Cite This Study

Grouping and complete diet composition in relation to parity and potential yield in dairy cows

Discussion

Member takes

Implication

Key Points

Cite This Study

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Also Consider