1994
DOI: 10.3168/jds.s0022-0302(94)77177-0
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Effects of Fat Saturation and Source of Fiber on Site of Nutrient Digestion and Milk Production by Lactating Dairy Cows

Abstract: Six primiparous cannulated cows were assigned to six treatments in a 6 x 6 Latin square design to evaluate the effects of degree of fat saturation and amount and source of effective fiber on site of nutrient digestion and milk production. Cows were fed for ad libitum intake a control diet with no added fat or diets with 5% added fat from saturated tallow, tallow, or animal-vegetable fat; the diets with animal-vegetable fat had 40% forage, 40% forage plus 20% soyhulls, or 60% forage. Ruminal acetate:propionate … Show more

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Cited by 155 publications
(174 citation statements)
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“…The lower fermentability for NCPCC than for NEPCM could also be due to nearly double the fat content in the NCPCC than in NEPCM likely resulting in more fat in the residue of NCPCC than in that of NEPCM. Unsaturated fatty acids that constitute a high proportion of canola oil reduce organic matter fermentability (Pantoja et al, 1994). Similar to total gas and VFA production per unit weight of undigested residue or of feedstuff, the AHF of GE (as % of GE in ileal digesta or feedstuff) of NEPCM were greater than that of NCPCC, indicating that the in vitro fermentation of NEPCM and NCPCC reflected the in vivo fermentation of these two feedstuffs.…”
Section: Figurementioning
confidence: 89%
“…The lower fermentability for NCPCC than for NEPCM could also be due to nearly double the fat content in the NCPCC than in NEPCM likely resulting in more fat in the residue of NCPCC than in that of NEPCM. Unsaturated fatty acids that constitute a high proportion of canola oil reduce organic matter fermentability (Pantoja et al, 1994). Similar to total gas and VFA production per unit weight of undigested residue or of feedstuff, the AHF of GE (as % of GE in ileal digesta or feedstuff) of NEPCM were greater than that of NCPCC, indicating that the in vitro fermentation of NEPCM and NCPCC reflected the in vivo fermentation of these two feedstuffs.…”
Section: Figurementioning
confidence: 89%
“…It is therefore possible that the fibre digestion may have been affected in the present trial when the fat content of TMR increased from 28 to 46 g kg -1 DM with increasing BF proportion. However, the mechanisms of digestion are complicated and besides intake, there are many other factors that can influence ruminal responses to supplemental fats, including fatty acid profile and chemical form of the fat (Pantoja et al 1994(Pantoja et al , 1995, ruminal availability of the fat (Ohajuruka et al 1991), Ca content of the diet (Bock et al 1991, as well as source, content and particle size of dietary fibre (Ben Salem et al 1993, Hussein et al 1995, Tackett et al 1996.…”
Section: Discussionmentioning
confidence: 99%
“…A maioria dos trabalhos revisados (Assis et al, 2004;Ipharraguerre et al, 2002a;Miron et al, 2004a;Miron et al, 2004b;Pantoja et al, 1994;Sarwar et al, 1992) indica teor de proteína do leite mais baixo para as dietas contendo CS em substituição a grãos de cereais. Ipharraguerre & Clark (2003) demonstraram em revisão que a redução no teor de proteína do leite entre os trabalhos compilados variou de 0,8 a 8% quando a CS substituiu o milho em grão em níveis de 18 a 48% da MS total, respectivamente.…”
Section: Tabela 1 -Composição Das Rações Experimentais (% Ms)unclassified
“…O teor de proteína do leite diminuiu significativamente com a substituição dos grãos de cereais por CS nos trabalhos realizados por , Sarwar et al (1992) e Pantoja et al (1994). Segundo Sarwar et al (1992), esta resposta pode ser parcialmente explicada pelo reduzido teor de carboridratos não-estruturais (CNE) de rações contendo altos níveis de CS, o que pode limitar a síntese de proteína microbiana no rúmen e reduzir o aporte de proteína metabolizável para o intestino delgado (ID), limitando a disponibilidade de aminoácidos na glândula mamária.…”
Section: Introductionunclassified