Feed ingredients can change physically or chemically when exposed to moisture,heat or pressure.These changes impact how well they flow through a bin and disperse throughout the feed.Microencapsulation is a relatively ...Feed ingredients can change physically or chemically when exposed to moisture,heat or pressure.These changes impact how well they flow through a bin and disperse throughout the feed.Microencapsulation is a relatively new technique used to reduce reactivity and improve storage and handling characteristics(HC)of nutrients.The authors hypothesize that lipid matrix microencapsulation of free vitamin and mineral(VM)premixes significantly improve their HC making them more desirable products for feed mills.Triplicate samples of free,standard and lipid microencapsulated VM premixes were evaluated for the following HC:particle size(dgw),particle size variability(Sgw),flowability(measured by angle of repose(AOR)and minimum orifice diameter(MOD)),lumping,compressibility,bulk and tapped density,solubility and hygroscopic percent change in weight(day 0-1,0-3,0-5,5-9,0-9).Results were analyzed in a 3×2 factorial(JMP Pro 14)of form(free,standard,microencapsulated)by type(vitamin,mineral).Microencapsulated VM had the highest dgw(611.0mm and 722.7mm,respectively,p=0.002);free and microencapsulated vitamins had the smallest Sgw(1.67 and 1.49,respectively,p<0.001).Microencapsulated premixes had significantly lower AOR(p<0.001)and MOD values(p<0.001)than other premixes,indicating improved flowability.From days 0-3 and 0-5,microencapsulated premixes absorbed approximately half as much moisture(1.62%and 2.24%,respectively)than the free(3.48%and 5.04%,respectively)or standard(3.74%and 5.26%,respectively)premixes(p=0.001).The benefits gained from lipid matrix microencapsulation technology not only improve the HC of animal feed additives,but also improve the stability of VM premixes.展开更多
This study was to determine apparent ileal digestibility of acid detergent fiber(ADF), neutral detergent fiber(NDF), dry matter(DM), energy, organic matter(OM), crude ash, digesta viscosity, and gut morphology in nurs...This study was to determine apparent ileal digestibility of acid detergent fiber(ADF), neutral detergent fiber(NDF), dry matter(DM), energy, organic matter(OM), crude ash, digesta viscosity, and gut morphology in nursery pigs fed diets containing xylanase(Lohmann Animal Nutrition GmbH, Cuxhaven, Germany). The diet(61% corn, 35% soybean meal, 1% poultry fat, and 3% minerals and vitamins) was mixed with 3 levels of xylanase(0,700, and 1400 LXU/kg). Thirty-six barrows(17.6 ± 3.3 kg) received one of 3 treatment diets based on a randomized complete block design with the initial body weight(BW) as a block. Pigs were individually housed and received experimental diets twice daily(0700 and 1700 h) at a fixed amount based on BW of pigs(0.09 x BW^(0.75) kg). Pigs were fed diets for 10 d, and chromium oxide(0.3%) was added to the diets from d 6 as an indigestible external marker. Pigs were euthanized at the end of d 10 for the collection of digesta and tissues. Jejunal digesta were centrifuged to measure viscosity using a viscometer(Brookfield Engineering Laboratories, Stoughton, MA). Diets and freeze-dried ileal digesta were used to measure ADF, NDF, and chromium to calculate apparent ileal digestibility of ADFand NDF. Villus height and crypt depth of jejunum were measured using a microscope(Fisher Scientific, Hampton, NH). Data were analyzed using polynomial contrasts in the MIXED procedure of SAS version 9.3(SAS Inc., Cary, NC, USA). Morphological measurements and ileal ADF digestibility were not affected by increasing xylanase. However, increasing xylanase supplementation from 0 to 1400 LXU/kg enhanced ileal digestibility of NDF(P < 0.042, linear) from 27.9 to 40.3%,DM(P < 0.006, linear) from 55.4 to 64.6%, OM(P < 0.006, linear) from 59.2 to 67.7%, and energy(P < 0.003,linear) from 58.8 to 68.0%. Viscosity of jejunal digesta decreased(P < 0.023) in a non-linear manner from 2.9 to 2.5 centipoises(cP). In conclusion, the usage of xylanase in corn and soybean meal based pig diets linearly enhanced digestibility of nutrients and affected viscosity of digesta in a non-linear manner.展开更多
文摘Feed ingredients can change physically or chemically when exposed to moisture,heat or pressure.These changes impact how well they flow through a bin and disperse throughout the feed.Microencapsulation is a relatively new technique used to reduce reactivity and improve storage and handling characteristics(HC)of nutrients.The authors hypothesize that lipid matrix microencapsulation of free vitamin and mineral(VM)premixes significantly improve their HC making them more desirable products for feed mills.Triplicate samples of free,standard and lipid microencapsulated VM premixes were evaluated for the following HC:particle size(dgw),particle size variability(Sgw),flowability(measured by angle of repose(AOR)and minimum orifice diameter(MOD)),lumping,compressibility,bulk and tapped density,solubility and hygroscopic percent change in weight(day 0-1,0-3,0-5,5-9,0-9).Results were analyzed in a 3×2 factorial(JMP Pro 14)of form(free,standard,microencapsulated)by type(vitamin,mineral).Microencapsulated VM had the highest dgw(611.0mm and 722.7mm,respectively,p=0.002);free and microencapsulated vitamins had the smallest Sgw(1.67 and 1.49,respectively,p<0.001).Microencapsulated premixes had significantly lower AOR(p<0.001)and MOD values(p<0.001)than other premixes,indicating improved flowability.From days 0-3 and 0-5,microencapsulated premixes absorbed approximately half as much moisture(1.62%and 2.24%,respectively)than the free(3.48%and 5.04%,respectively)or standard(3.74%and 5.26%,respectively)premixes(p=0.001).The benefits gained from lipid matrix microencapsulation technology not only improve the HC of animal feed additives,but also improve the stability of VM premixes.
文摘This study was to determine apparent ileal digestibility of acid detergent fiber(ADF), neutral detergent fiber(NDF), dry matter(DM), energy, organic matter(OM), crude ash, digesta viscosity, and gut morphology in nursery pigs fed diets containing xylanase(Lohmann Animal Nutrition GmbH, Cuxhaven, Germany). The diet(61% corn, 35% soybean meal, 1% poultry fat, and 3% minerals and vitamins) was mixed with 3 levels of xylanase(0,700, and 1400 LXU/kg). Thirty-six barrows(17.6 ± 3.3 kg) received one of 3 treatment diets based on a randomized complete block design with the initial body weight(BW) as a block. Pigs were individually housed and received experimental diets twice daily(0700 and 1700 h) at a fixed amount based on BW of pigs(0.09 x BW^(0.75) kg). Pigs were fed diets for 10 d, and chromium oxide(0.3%) was added to the diets from d 6 as an indigestible external marker. Pigs were euthanized at the end of d 10 for the collection of digesta and tissues. Jejunal digesta were centrifuged to measure viscosity using a viscometer(Brookfield Engineering Laboratories, Stoughton, MA). Diets and freeze-dried ileal digesta were used to measure ADF, NDF, and chromium to calculate apparent ileal digestibility of ADFand NDF. Villus height and crypt depth of jejunum were measured using a microscope(Fisher Scientific, Hampton, NH). Data were analyzed using polynomial contrasts in the MIXED procedure of SAS version 9.3(SAS Inc., Cary, NC, USA). Morphological measurements and ileal ADF digestibility were not affected by increasing xylanase. However, increasing xylanase supplementation from 0 to 1400 LXU/kg enhanced ileal digestibility of NDF(P < 0.042, linear) from 27.9 to 40.3%,DM(P < 0.006, linear) from 55.4 to 64.6%, OM(P < 0.006, linear) from 59.2 to 67.7%, and energy(P < 0.003,linear) from 58.8 to 68.0%. Viscosity of jejunal digesta decreased(P < 0.023) in a non-linear manner from 2.9 to 2.5 centipoises(cP). In conclusion, the usage of xylanase in corn and soybean meal based pig diets linearly enhanced digestibility of nutrients and affected viscosity of digesta in a non-linear manner.
