ABSTRACT:
Fat coating of soybean meal (SBM) can reduce its protein degradability
in the rumen, but the encapsulation of SBM with palmitic
(PA) and stearic acids (SA) has not yet been investigated, despite
both fatty acids are common energy sources in dairy cow diets. This
study aimed to evaluate the effects of applying a novel method,
using either 400 or 500 g fat/kg (treatments FL40 and FL50, respectively),
which was enriched in PA and SA at different ratios (100:0,
75:25, 50:50, 25:75 and 0:100), on physical and chemical characteristics,
ruminal degradability, solubility and in vitro intestinal protein
digestibility (IVIPD) of the obtained products. Encapsulation of SBM
in fat resulted in greater mean particle size and lower bulk density
and protein solubility than unprotected SBM (USBM). Treatment
FL50 resulted in increased (p < 0.01) rumen-undegraded protein
(RUP) compared to USBM. There were no differences in RUP of SBM
when different PA: SA ratios were used. The mean RUP content of
treatments FL40 and FL50 (306 and 349 g/kg, respectively) was
greater compared to USBM (262 g/kg, p < 0.05), but lower than
that for a standard heat-treated SBM (431 g/kg). Values of IVIPD did
not differ among SBM, heat-treated SBM and FL40 and FL50 samples,
all being greater than 97.8%. In conclusion, encapsulation of
SBM with fats enriched in PA and SA proved to be effective in
reducing protein solubility and increasing RUP without depressing
protein digestibility in the intestine. For validation of the method,
in vivo research to investigate the effects of these products on the
production of dairy cows is warranted.
KEYWORDS
Encapsulation; fat; in vitro
digestibility; protein
degradation; rumen;
soyabean meal
Publisher: Archives of Animal Nutrition Volume 73, 2019 – Issue 2
Quartiles : Q1
IMPACT FACTOR: 2.242
Country: UK
Target Animal: Dairy Cow
Product under study: Yasminomax