6TK6FYBL

2638

15 janvier 2021 10:06

15 janvier 2021 10:06

The aim of the present study was to assess the near infrared (NIR) technique for the evaluation of fibre digestibility in lactating cows. The undigested neutral detergent fibre (uNDF) content of faeces and diets obtained from an in vivo total tract collection trial was determined by NIR spectroscopy and the values were used to estimate total tract fibre digestibility (TTNDFD). The diets were characterised by their different forage basis: maize silage (MS); wheat silage (WS); lucerne and grass silages (LGS) or hays (LGH). Using the same methodology, total mixed ration and faeces samples were later collected on commercial farms from cows fed diets with different forage: grass silage (GS); wheat silage (WS); sorghum and lucerne in an organic system (ORG). The average values of TTNDFD were 42.8 vs 43.2%, respectively for NIR and in vivo data (P=0.784). The TTNDFD was affected by diet with highest values for MS (48.2) and LGS (48.8), intermediate for WS (40.8) and lowest for LGH (34.2) (P<0.05). The regression equation between NIR-TTNDFD and in vivo-TTNDFD% was: y=0.898 in vivo-TTNDFD + 3.91 (R2=0.809). In the commercial farms, although the difference was not significant, TTNDFD (%) of cows fed ORG (59.3) was higher than GS (55.0) and WS (53.1).

None

• AB - Modalité bio
• FREDO alimentation animale
• FREDO fourrage et prairie
• FREDO technologie et innovation
• GEO Italie
• lactating sows
• NIR
• digestibility
• fibre
• forage
• grassland
• porc
• élevage

807

10/2020

1 octobre 2020