Use of fat-coated or heat-treated soybean meal for partial replacement of solvent-extracted soybean meal in the diets of early lactation dairy cows

Autor: Mohsen Sahraei Belverdy, Ali Akbar Khadem, Ali A. Alamouti, Jaber Khani, Sergio Calsamiglia
Rok vydání: 2021
Předmět:
Zdroj: Animal Production Science. 62:783-791
ISSN: 1836-5787
1836-0939
DOI: 10.1071/an21255
Popis: Context Soybean meal (SBM) is the most important protein source used to feed dairy cows, and methods have been developed to increase its nutritional value by protecting the proteins against rumen degradation. Protection of solvent-extracted SBM with saturated fats can achieve this, but effects on lactation performance and nutrient digestibility have not been investigated. Aims We evaluated effects on performance, nutrient digestibility and blood metabolites of high-yielding dairy cows when dietary solvent-extracted SBM was partially replaced with two fat-coated SBM products containing palmitic acid or a palmitic–stearic acid mix, or with standard heat-treated SBM. Methods Forty lactating Holstein cows were used in a randomised complete block design experiment with two phases each of 26 days (20 days of diet adaptation and 6 days of data collection). Experimental diets comprised (per kg DM) 271 g maize silage, 138 g other forages and 590 g concentrate, with 6.74 MJ net energy for lactation, 157 g crude protein and 366 g neutral detergent fibre. The control diet contained solvent-extracted SBM at 73.1 g/kg, which was partially replaced in the three test diets: two with fat-coated SBM (400 g fat/kg, enriched with palmitic acid or 50:50 palmitic:stearic acids), and one with heat-treated SBM. Diets were offered ad libitum during the experiment, and cows were milked three times daily. Key results Solvent-extracted SBM had significantly lower rumen undegraded protein concentration than the other three products. Dry matter intake was not affected by dietary treatment (27.7 ± 0.531 kg/day), nor was milk yield (47.8–50.3 kg/day), but milk fat yield tended to be greater (P
Databáze: OpenAIRE
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