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<p>High-concentrate feeding systems are widely applied in intensive lamb production to improve growth efficiency; however, such diets may impair rumen stability and nutrient utilization. This study evaluated the individual and combined effects of chromium picolinate (CrPic) and sodium bicarbonate (Bic) supplementation on growth performance, feed efficiency, rumen fermentation characteristics, protozoal population density, nutrient digestibility, and carcass traits in lambs fed high-concentrate diets. Twenty-eight weaned male Bafra lambs were randomly allocated to four dietary treatments (<i>n</i> = 7): control, CrPic (0.25&#xa0;mg elemental chromium/head/day), Bic (1.5% of dietary dry matter), and CrPic + Bic. Following a 15-day adaptation period, lambs were fed experimental diets for 63 days under individual-feeding conditions. Feed intake, body weight, rumen fermentation parameters, and apparent nutrient digestibility were determined. Body weight and dry matter intake were not significantly affected by dietary treatment (<i>P</i> &gt; 0.05), although both variables changed over time throughout the experimental period (<i>P</i> &lt; 0.001). Average daily gain and feed conversion ratio were significantly influenced by treatment, time, and treatment × time interactions (<i>P</i> &lt; 0.05), indicating phase-dependent responses to supplementation. Lambs receiving the combined chromium picolinate and sodium bicarbonate supplementation exhibited improved feed efficiency and greater average daily gain during specific growth phases, particularly between days 14 and 28. Chromium picolinate supplementation reduced ruminal ammonia-N concentration (<i>P</i> &lt; 0.001), increased protozoal counts (<i>P</i> &lt; 0.001), and improved acid detergent fiber digestibility (<i>P</i> &lt; 0.05), whereas sodium bicarbonate supplementation had limited effects on overall performance and rumen fermentation characteristics. Chromium picolinate and sodium bicarbonate exert distinct physiological effects on rumen fermentation, nutrient utilization, and productive performance in lambs fed high-concentrate diets. The combined supplementation strategy improved feed efficiency during specific growth phases, suggesting that its benefits may be greatest during adaptation to intensive feeding systems. However, these responses were not consistently reflected in carcass characteristics.</p>

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Effects of combined chromium picolinate and sodium bicarbonate supplementation on growth performance, rumen fermentation, nutrient digestibility, protozoal population, and carcass traits in lambs fed high-concentrate diets

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  • 发表日期：

    2026年6月22日

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  • Erkil Onur Günüç,
  • Mustafa Salman

摘要

High-concentrate feeding systems are widely applied in intensive lamb production to improve growth efficiency; however, such diets may impair rumen stability and nutrient utilization. This study evaluated the individual and combined effects of chromium picolinate (CrPic) and sodium bicarbonate (Bic) supplementation on growth performance, feed efficiency, rumen fermentation characteristics, protozoal population density, nutrient digestibility, and carcass traits in lambs fed high-concentrate diets. Twenty-eight weaned male Bafra lambs were randomly allocated to four dietary treatments (n = 7): control, CrPic (0.25 mg elemental chromium/head/day), Bic (1.5% of dietary dry matter), and CrPic + Bic. Following a 15-day adaptation period, lambs were fed experimental diets for 63 days under individual-feeding conditions. Feed intake, body weight, rumen fermentation parameters, and apparent nutrient digestibility were determined. Body weight and dry matter intake were not significantly affected by dietary treatment (P > 0.05), although both variables changed over time throughout the experimental period (P < 0.001). Average daily gain and feed conversion ratio were significantly influenced by treatment, time, and treatment × time interactions (P < 0.05), indicating phase-dependent responses to supplementation. Lambs receiving the combined chromium picolinate and sodium bicarbonate supplementation exhibited improved feed efficiency and greater average daily gain during specific growth phases, particularly between days 14 and 28. Chromium picolinate supplementation reduced ruminal ammonia-N concentration (P < 0.001), increased protozoal counts (P < 0.001), and improved acid detergent fiber digestibility (P < 0.05), whereas sodium bicarbonate supplementation had limited effects on overall performance and rumen fermentation characteristics. Chromium picolinate and sodium bicarbonate exert distinct physiological effects on rumen fermentation, nutrient utilization, and productive performance in lambs fed high-concentrate diets. The combined supplementation strategy improved feed efficiency during specific growth phases, suggesting that its benefits may be greatest during adaptation to intensive feeding systems. However, these responses were not consistently reflected in carcass characteristics.