The Relationship Between Acid Detergent Insoluble Nitrogen and Nitrogen Digestibility in Lactating Dairy Cattle

Machacek, K.J.; Kononoff, P.J.

doi:10.15232/s1080-7446(15)30778-6

Cited by 15 publications

(12 citation statements)

References 16 publications

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Section: Discussionsupporting

confidence: 69%

“…Consequently, this assumption is not always true, and in particular it depends on the cropping system of legumes. Previous investigations demonstrated that the ADF content is inappropriate for the prediction of CP fraction C due to the poor relationship between CP fraction C and ADF content (Machacek & Kononoff 2009), confirming only the observations for the pure red clover stands. The AUC computation of the CP fractions facilitated an assessment of the differences in the amount of CP fraction A, B and C between legume species and year, which may be produced within one growth period.…”

Section: Discussionsupporting

confidence: 66%

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Changes in crude protein fractions of forage legumes during the spring growth and summer regrowth period

et al. 2012

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Only a few previous studies have analysed the crude protein (CP) fractions of the Cornell Net Carbohydrate and Protein System during the growth period of forage legumes. The objective of the present study was to investigate the changes in CP fractions during the spring growth and summer-autumn regrowth period of five forage legume species (alfalfa (also known as lucerne, Medicago sativa L.), birdsfoot trefoil (Lotus corniculatus L.), kura clover (Trifolium ambiguum M.B.), red clover (Trifolium pratense L.) and white clover (Trifolium repens L.)) grown in binary mixtures with perennial ryegrass (Lolium perenne L.) and also in pure stands (two red clover cultivars). Additionally, the specific polyphenol oxidase (PPO) activity was measured photometrically in the leaves of pure red clover swards. In both pure and mixed cropping, CP fraction A increased with advancing maturity, except for the legumes from mixed cropping in the summer-autumn growth period 2004 and 2005. The variation of CP fraction A was mostly positively related to the N yield and the amount of dinitrogen fixation. Although CP fraction A of pure red clover was negatively correlated with the specific PPO activity in the spring growth period, the specific PPO activity was less relevant for the variation of CP fraction A with respect to the whole growing season. CP fraction B generally made up the largest proportion of the CP. Pure red clover stands showed reducing amounts of CP fraction C during the growth period, whereas in legumes grown with ryegrass an increase was usually observed. Despite these differences, there was generally an increase of CP fraction C when the content of nonstructural carbohydrates decreased. Red clover and birdsfoot trefoil herbage contained the highest proportions of CP fraction C in the CP, regardless of growth period and year. In conclusion, red clover and birdsfoot trefoil had a more favourable CP composition for ruminant nutrition compared to the other legume species, and in red clover this could not be clearly attributed to the specific PPO activity.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionsupporting

confidence: 66%

Changes in crude protein fractions of forage legumes during the spring growth and summer regrowth period

et al. 2012

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“…Os altos teores de NIDA encontrados no alimento estão associados a sua menor digestibilidade, visto que esta fração é mais resistente à ação dos microorganismos ruminais, por estarem associados à lignina e a outros compostos de difícil degradação (Van Soest, 1994;Machacek & Kononoff, 2009). No entanto, os baixos teores de NIDA encontrados neste trabalho são insuficientes para comprometer a disponibilidade dos nutrientes para o metabolismo do animal, principalmente quando associados aos teores de DIVMS do coproduto in natura (Tabela 1) e nas silagens (Tabela 4).…”

Section: Resultsunclassified

Silagem de capim-elefante adicionada de casca de abacaxi

et al. 2017

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Neste trabalho, foram avaliadas as características fermentativas e químico-bromatológicas da silagem de capimelefante (CE) com diferentes níveis de inclusão, durante a ensilagem, do coproduto da extração da polpa do abacaxi, a casca de abacaxi (CA), nas proporções de 0,0; 12,5; 25,0; 37,5 e 50,0%, da matéria natural do capim-elefante. O material foi ensilado em silos laboratoriais e, após 180 dias, os silos foram abertos e coletaram-se amostras para a determinação dos teores de matéria seca (MS); carboidratos solúveis (CHOS); potencial hidrogeniônico (pH); nitrogênio amoniacal em percentagem do nitrogênio total (NNH 3 /NT); extrato etéreo (EE); proteína bruta (PB); proteína insolúvel em detergente neutro em percentagem do nitrogênio total (PIDN/NT); proteína insolúvel em detergente ácido em percentagem do nitrogênio total (PIDA/NT); fibra em detergente neutro (FDN); fibra em detergente ácido (FDA); celulose (CEL); lignina (LIG); nitrogênio insolúvel em detergente neutro (NIDN); nitrogênio insolúvel em detergente ácido (NIDA) e digestibilidade in vitro da matéria seca (DIVMS). Para a avaliação do efeito dos tratamentos, utilizou-se delineamento experimental inteiramente casualizado, com quatro repetições, executando-se o estudo de regressão para cada variável analisada (P < 0,05). De acordo com as equações de regressão, para as características fermentativas, as silagens podem ser consideradas de muito boa qualidade. Quanto às frações fibrosas da silagem, a inclusão de níveis crescentes deste coproduto contribuiu para diminuí-las, o que pode ser confirmado pelos resultados encontrados para a DIVMS. A inclusão da CA durante a ensilagem do capim-elefante favorece a fermentação e melhora o valor nutritivo das silagens, sendo recomendada em todos os níveis de inclusão avaliados. Palavras Elephant grass silage added with pineapple peelWe evaluated the qualitative, fermentative, and chemical characteristics of elephant grass silage containing different levels of inclusion of coproduct of the pineapple pulp extraction, pineapple peel -(0.0%, 12.5%, 25.0%, 37.5%, and 50.0%) in relation to natural field of elephant grass during ensiling. The material was ensiled in laboratory silos and after 180 days, the silos were opened and samples were collected for determination of dry matter, soluble carbohydrates, pH, ammonia nitrogen in percentage of total nitrogen, ether extract, crude protein, neutral detergent insoluble protein as a percentage of total nitrogen, acid detergent insoluble protein as a percentage of total nitrogen, neutral detergent fiber, acid detergent fiber, cellulose, lignin, neutral detergent insoluble nitrogen, acid detergent insoluble nitrogen, and in vitro digestibility of dry matter. To assess the effect of the treatments, we used a completely randomized design with four replications, running the regression analysis for each variable analyzed (P<0.05). According to the regression equations for the fermentative characteristics, the silages can be considered of very good quality. As for fiber digest...

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“…This is probably due to higher lignin concentrations in legumes compared with grasses . Accordingly, higher ADF contents of legume species, especially for the last harvest dates (where legumes showed significantly larger C fractions compared with grasses), were expected since the ADF residue is used for determination of fraction C. Nevertheless, an earlier study by Machacek and Konnonoff showed that ADF content is poorly related to fraction C content and thus is not appropriate for such prediction. Sanderson and Wedin stated that factors other than or including the lignin content may contribute to the size of fraction C.…”

Section: Discussionmentioning

confidence: 99%

Dry matter yield, chemical composition and estimated extractable protein of legume and grass species during the spring growth

et al. 2017

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White clover could be a good candidate for protein production purpose in a biorefinery due to its high extractable protein content per kg DM. In order to maximise the protein production capacity, harvest should take place during early growth due to a decline in protein extractability with maturity. The final economy of the concept will depend on the value of the fibre after extraction of the protein. © 2017 Society of Chemical Industry.

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The Relationship Between Acid Detergent Insoluble Nitrogen and Nitrogen Digestibility in Lactating Dairy Cattle

Abstract: Five trials (19 treatments)

Cited by 15 publications

References 16 publications

Changes in crude protein fractions of forage legumes during the spring growth and summer regrowth period

Changes in crude protein fractions of forage legumes during the spring growth and summer regrowth period

Silagem de capim-elefante adicionada de casca de abacaxi

Dry matter yield, chemical composition and estimated extractable protein of legume and grass species during the spring growth

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