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Effect of physical effectiveness on digestibility of ration for cows in early lactation
Author(s) -
Stojanovic B.,
Grubic G.,
Djordjevic N.,
Bozickovic A.,
Ivetic A.,
Davidovic V.
Publication year - 2014
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/jpn.12129
Subject(s) - dry matter , neutral detergent fiber , lactation , zoology , chemistry , silage , forage , nutrient , net energy , particle size , digestion (alchemy) , food science , agronomy , biology , chromatography , pregnancy , organic chemistry , genetics
Summary A study was conducted to investigate the effects of a diet particle size on nutrient digestibility in cows in early lactation. Treatments were diets with forage to concentrate ratio 43:57% in diet dry matter, with four different physically effective fibres (pe NDF ) content based on different cut length of corn silage and alfalfa haylage. The physical effectiveness factors (pef) and pe NDF content of TMR s (total mixed ration) were determined using Penn State Particle Separator ( PSPS ) with two (pef 8.0 , pe NDF 8.0 ) or three (pef 1.18 , pe NDF 1.18 ) sieves. The reducing of cut length of forages and particle size of diets did not affect on dry matter intake, while decreased pe NDF intake by 16.34 and 8.83%, for pe NDF 8.0 and pe NDF 1.18 respectively. Apparent total tract digestibility of the nutrients was measured using two indicators: acid insoluble ash ( AIA ) and acid detergent insoluble lignin ( ADL ). Decreasing of forages cut length significantly increased apparent total tract digestibility of neutral detergent fibre ( NDF ) from 48.39% to 53.84% and from 53.9% to 58.66%, of crude protein from 73.96% to 79.24% and from 71.56% to 77.90%, with contemporary decreasing of non‐fibre carbohydrate from 90.89% to 84.81% and from 91.99% to 86.80%, with AIA or ADL as indicator respectively. Dietary value of net energy for lactation ( NE L ) and energy intake was not affected by the pe NDF content of the diet.