Effect of Direct-Fed Fibrolytic Enzymes on the Lactational Performance of Dairy Cows

Lewis, Graceanna; Sánchez, William; Hunt, C. W.; Guy, M.A.; Pritchard, G T; Swanson, B.I.; Treacher, R.J.

doi:10.3168/jds.s0022-0302(99)75274-4

Cited by 110 publications

(119 citation statements)

References 13 publications

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“…On the other hand, several researchers recorded an increase in DMI of dairy cows when fibrolytic enzymes was applied to forage before mixing with other ingredients (Lewis et al, 1999) or applied to TMR or concentrate portion of the diet (Bowman et al, 2002;Ware & Zinn, 2005). However, the effects of fibrolytic enzymes on DMI appear to be vary among enzymes products and the method of applying of enzymes (Bowman et al, 2002) A number of studies have examined the effects of fibrolytic exogenous enzymes on digestibility and milk production in dairy cows.…”

Section: Discussionmentioning

confidence: 99%

“…However, the effects of fibrolytic enzymes on DMI appear to be vary among enzymes products and the method of applying of enzymes (Bowman et al, 2002) A number of studies have examined the effects of fibrolytic exogenous enzymes on digestibility and milk production in dairy cows. In some studies, dietary addition of fibrolytic enzymes either to forages or concentrate portion increased milk production from 5-16% (Lewis et al, 1999;Gado et al, 2009;Holtshausen et al, 2011) as noticed at the current study but no milk response was reported in others (Elwakeel et al, 2007;Bernard et al, 2010). Furthermore, these enhancement in milk yield at the current study are in line with those found by Guerra et al (2007) who used Fibrozyme in diet containing alfalfa hay and they reported that Fibrozyme supplementation increased milk yield, which may be due to improved utilization of nutrients in digestive tract and in rumen and increased gain of net energy.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Dietary Supplementation With Fibrolytic Enzymes on the Productive Performance of Early Lactating Dairy Cows

Mohamed¹,

Borhami²,

El-Shazly³

et al. 2013

JAS

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This study was conducted to investigate the impacts of exogenous fibrolytic enzymes (Fibrozyme, Alltech inc company, USA) supplementation for 12 weeks on milk production and composition as well as blood metabolites in early lactating dairy cows. Total of 120 multiparous Holstein dairy cows at early lactation (57±4.2 days in milk) were randomly assigned into two groups according to lactation period "stage of lactation" and lactation season. The first group (control, n=60) were fed total mixed ration (TMR) without a supplement of exogenous fibrolytic enzymes. The second group (treatment, n=60) were fed TMR supplemented with a commercial exogenous fibrolytic enzymes at the rate of 15 g/cow/d for 12 weeks. Each group was placed in a shaded pen equipped with free stalls. An exogenous fibrolytic enzymes was added to the TMR at the time of feeding once per day at 10 am. Cows were fed as a group open feed, with free access to water.The results of this experiment on dairy cows showed that there were not significant changes in dry matter intake of lactating dairy cows with or without a supplement of exogenous fibrolytic enzymes at early lactation. Exogenous fibrolytic enzymes supplementd to lactating dairy cows improved (P<0.003) milk yield (41.0 vs. 39.5 kg/cow/d) compared to untreated dairy cows. Also, the fat corrected milk was increased (P<0.025) as a response to exogenous fibrolytic enzymes supplementation to lactating dairy cows compared to un-supplemented dairy cows. In addition, the supplementation of exogenous fibrolytic enzymes enhanced (P<0.006) the energy corrected milk (40.6 vs. 39.4 kg) and feed efficiency in early lactating dairy cows compared to the control group. The results revealed that supplementation of exogenous fibrolytic enzymes had no significant effect on milk fat, protein lactose and solid not fat (SNF) percentage compared to the control group of dairy cows. While, the quantities of milk protein (1.36 vs. 1.30kg), lactose (2.0 vs. 1.92kg) and SNF (3.47 vs. 3.31kg) in supplemented-dairy cows were improved significantly compared to the control group except quantity of milk fat (P<0.096). Serum glucose, albumin, urea and triglycerides were not affected (P>0.05) but total protein, globulin and cholesterol were declined (P<0.05) due to fibrozyme inclusion compared to control group of dairy cows. The supplementation of exogenous fibrolytic enzymes to early lactating dairy cows achieved higher net profit by 0.93 US$ per cow than control group. It is concluded that exogenous fibrolytic enzymes supplementation to early lactating dairy cows improved significantly milk production, SNF and energy corrected milk.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effect of Dietary Supplementation With Fibrolytic Enzymes on the Productive Performance of Early Lactating Dairy Cows

Mohamed¹,

Borhami²,

El-Shazly³

et al. 2013

JAS

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“…Interestingly, the increase in bacterial numbers disappeared when higher levels of enzyme supplementation were used. This quadratic response may explain the non-linear dose responses typically observed in vivo Lewis et al 1999;Kung et al 2000).…”

Section: Stimulation Of Rumen Microbial Populationsmentioning

confidence: 92%

Mode of action of exogenous cell wall degrading enzymes for ruminants

Beauchemin¹,

Colombatto²,

Morgavi³

et al. 2004

Can. J. Anim. Sci.

120

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Rode, L. M. 2004. Mode of action of exogenous cell wall degrading enzymes for ruminants. Can. J. Anim. Sci. 84: [13][14][15][16][17][18][19][20][21][22]. Recent studies have shown that adding exogenous fibrolytic enzymes to ruminant diets can increase milk production of dairy cows and weight gain of growing beef cattle as a result of enhanced feed digestion. While much progress has been made in terms of advancing feed enzyme technology for ruminants, considerable research is still required to develop more effective enzyme products. The mode of action whereby exogenous enzymes improve digestion of plant cell wall is complex, and there is evidence for numerous potential modes of action suggesting they are interdependant. A mode of action that accounts for the most critical factors that explain the observed increases in feed digestion is presented. Adding exogenous enzymes to the diet increases the hydrolytic capacity of the rumen mainly due to increased bacterial attachment, stimulation of rumen microbial populations and synergistic effects with hydrolases of ruminal microorganisms. The net effect is increased enzymic activity within the rumen, which enhances digestibility of the total diet fed. Thus, improvements in digestibility are not limited to the dietary component to which the enzymes are applied, which explains why fibrolytic enzymes can be effective when added to supplement or grain. The magnitude of the improvements in feed digestibility reported in some research studies using feed enzymes suggests a viable future for enzyme products in commercial ruminant production systems. A more complete understanding of the mode of action of these products will allow development of low-cost enzyme products designed specifically to improve feed digestion by ruminants. Des études récentes montrent que l'addition d'enzymes fibrolytiques exogènes à la ration des ruminants accroît la production des vaches laitières et le poids gagné par les bovins de boucherie à cause d'une meilleure digestion des aliments. Bien que la technologie des enzymes alimentaires destinés aux ruminants ait progressé, il reste encore beaucoup à faire avant qu'on arrive à des produits enzymatiques plus efficaces. La manière dont les enzymes exogènes facilitent la digestion de la paroi cellulosique est particulièrement complexe et tout indique que les nombreux modes d'action potentiels sont interdépendants. Les auteurs proposent un mode d'action qui tient compte des principaux facteurs expliquant la meilleure digestion des aliments observée. L'addition d'enzymes exogènes à la ration accroît la capacité d'hydrolyse du rumen principalement à cause d'une meilleure fixation des bactéries, d'une stimulation de la microflore du rumen et de la synergie avec les hydrolases des microorganismes. Il s'ensuit une plus grande activité enzymatique dans le rumen, ce qui améliore la digestibilité de la ration. Cette meilleure digestibilité ne vient donc pas uniquement de la composante alimentaire à laquelle s'attaquent les enzymes, ce qui explique l'efficacité de...

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“…McAllister et al (1999), avaliando o desempenho de novilhos em confinamento, observaram aumentos de 5,99 kg/dia para 6,72 kg/dia na ingestão de MS e de 0,94 kg/dia para 1,16 kg/dia no ganho médio diário com a suplementação enzimática (celulase e xilanase). Lewis et al (1995), em estudo com vacas em lactação consumindo forragem, também verificaram aumentos de 5 a 25% no consumo e na produção de leite com a adição de enzimas fibrolíticas exógenas na dieta.…”

Section: Introductionunclassified

Consumo e digestibilidade aparente total em bovinos sob suplementação com enzimas fibrolíticas

Martins¹,

Vieira

Berchielli

et al. 2006

R. Bras. Zootec.

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RESUMO -Avaliou-se o efeito da suplementação com enzimas fibrolíticas (celulase e xilanase) sobre o consumo e a digestibilidade aparente total dos nutrientes de dietas compostas de silagem de milho e feno de tifton 85 (Cynodon spp.) cortado aos 90 dias. Oito bovinos (340 kg de PV) fistulados no rúmen foram distribuídos em dois quadrados latinos 4 x 4, em esquema fatorial 2 x 2 (fonte de volumoso e adição ou não de enzimas). O complexo enzimático testado foi proveniente de fonte comercial e extraído dos fungos Aspergillus niger e Trichoderma longibrachiatum, sendo fornecido na quantidade de 12 g/ animal/dia, misturado à ração total. Não houve efeito da suplementação enzimática sobre o consumo de nutrientes para ambos os volumosos, porém, a adição de enzimas aumentou a digestibilidade total de FDN, FDA e CEL de 36,87; 36,21 e 46,89%, respectivamente, para 41,19; 40,01 e 50,46%, respectivamente.Palavras-chave: celulase, feno de tifton, ruminantes, silagem de milho, xilanase Intake and apparent total tract digestibility in cattle supplemented with fibrolytic enzymes ABSTRACT -The objective of this trial was to evaluate the effect of feeding fibrolytic enzyme (cellulose and xylanase) on intake and apparent total tract digestibility of nutrients in cattle receiving diets containing corn silage or Tifton 85 hay (Cynodon spp.). Eight animals fitted with ruminal cannulae and averaging 340 kg of body weight were randomly assigned to two replicated 4 x 4 Latin squares in a 2 x 2 factorial arrangement of treatments (forage sources with or without fibrolytic enzyme supplementation). The commercial enzymatic complex used, which was extracted from Aspergillus niger and Trichoderma longibrachiatum fungi was mixed with the forage and concentrate and supplied at a daily amount of 12 g/animal. There was no effect of enzymatic supplementation on nutrient intake for both forage sources. However, the addition of fibrolytic enzymes increased the apparent total tract digestibilities of neutral detergent fiber (NDF), acid detergent fiber (ADF) and cellulose from 36.87, 36.21, and 46.89% to 41.19, 40.01, and 50.46%, respectively. Key Words: cellulase, corn silage, ruminants, tifton hay, xylanase IntroduçãoNos sistemas de produção de ruminantes, grande parte (40 a 90%) das exigências nutricionais é atendida por meio de volumosos e, em algumas regiões do país, os rebanhos destinados à produção de carne e leite dependem de forragens conservadas para o suprimento de nutrientes durante os períodos de escassez de alimentos.Segundo Van Soest (1965), o consumo de alimentos é inversamente relacionado ao teor de FDN em dietas com mais de 60% deste nutriente, de modo que a parede celular é o constituinte da planta que possui maior relação com o consumo voluntário.O aproveitamento de alimentos fibrosos pelos ruminantes está relacionado à síntese e secreção de enzimas pelos microrganismos do rúmen, promovendo a hidrólise da parede celular das plantas. Entretanto, a conversão dos alimentos, especialmente os fibrosos, para produção de carne e leite ...

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Effect of Direct-Fed Fibrolytic Enzymes on the Lactational Performance of Dairy Cows

Cited by 110 publications

References 13 publications

Effect of Dietary Supplementation With Fibrolytic Enzymes on the Productive Performance of Early Lactating Dairy Cows

Effect of Dietary Supplementation With Fibrolytic Enzymes on the Productive Performance of Early Lactating Dairy Cows

Mode of action of exogenous cell wall degrading enzymes for ruminants

Consumo e digestibilidade aparente total em bovinos sob suplementação com enzimas fibrolíticas

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