Symposium on Forage Evaluation: I. What is Forage Quality from the Animal Standpoint?<sup>1</sup>

Reid, J. T.; Kennedy, W.K.; Turk, K.L.; Slack, S. T.; Trimberger, G. W.; Murphy, R. P.

doi:10.2134/agronj1959.00021962005100040009x

Cited by 39 publications

(17 citation statements)

References 2 publications

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“…Correlations of Kentucky bluegrass leaf concentration with all quality parameters were lower than those of other species. These results for tall growing grasses concur with those of Reid et al (1959), who found that leaf concentration of a variety of forages was highly correlated with For personal use only.…”

Section: Association Of Leaf and Stem Concentration With Forage Qualisupporting

confidence: 90%

Maturation effects on forage quality of Kentucky bluegrass

Hockensmith¹,

Marten²,

Halgerson³

1997

Can. J. Plant Sci.

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quality of Kentucky bluegrass. Can. J. Plant Sci. 77: 75-80. Kentucky bluegrass (Poa pratensis L.) is an important constituent of many permanent pastures in the northern United States and is an important source of livestock feed, but there is a paucity of information on its forage quality. The objective of this research was to assess changes with maturity in forage quality of whole herbage, leaves, and stems of Kentucky bluegrass compared with other important cool-season forage grasses. Kentucky bluegrass, orchardgrass (Dactylis glomerata L.), reed canarygrass (Phalaris arundinaceae L.), smooth bromegrass (Bromus inermis Leyss), timothy (Phleum pratense L.), and tall fescue (Festuca arundinacea Schreb) were sampled weekly beginning in mid-May until each species reached milk stage. Kentucky bluegrass had the highest or was among the grasses with the highest average leaf percentage, and leaf, stem, and whole herbage neutral detergent fiber (NDF) and acid detergent lignin (ADL) concentrations; and lowest average whole herbage, leaf, and stem in vitro digestible dry matter (IVDDM) concentrations compared with tall growing species. Kentucky bluegrass also had the slowest rates of change in leaf and stem concentration and in whole herbage IVDDM and NDF concentrations with maturity. Leaf concentration was negatively correlated with herbage NDF and ADL concentration, but was not correlated with herbage IVDDM and CP concentration. Relative to tall growing cool season grasses, Kentucky bluegrass is leafier, but it has poorer forage digestibility. Mots clés: Poa pratensis L., qualité fourragère, graminée vivace, feuille, tige Herbage quality of cool-season grasses declines with advancing maturation. Herbage digestibility and CP concentration decrease, whereas fiber and lignin concentrations increase with maturation (Pritchard et al. 1963;Mowat et al. 1965). The decline in whole herbage quality of smooth bromegrass (Bromus inermis Leyss) with maturation was attributed to a decrease in the leaf/stem mass ratio as well as to changes in the quality of leaf and stem fractions. Leaves and stems of tall growing grasses may have similar digestibility when vegetative, but by heading, stems typically have lower digestibility and CP concentration and higher lignin and fiber concentration than leaves (Pritchard et al. 1963;Smith 1973;Sanderson and Wedin 1989). Species differences in leaf and stem quality at post-heading stages result, in part, from varying rates of decline in quality of each fraction (Buxton and Marten 1989). Sanderson and Wedin (1989) reported that IVDDM of smooth bromegrass leaf blades declined 3 g kg -1 for each phenological stage while stems declined 7 g kg -1 for each phenological stage.The aforementioned research on relationships of maturity with forage quality is primarily focused on tall growing 75 Abbreviations: ADL, acid detergent lignin; CP, crude protein; IVDDM, in vitro digestible dry matter; NDF, neutral detergent fiber; NIRS, near infrared reflectance spectroscopy Can. J. Plant Sci. Downloaded from www....

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Section: Association Of Leaf and Stem Concentration With Forage Qualisupporting

confidence: 90%

Maturation effects on forage quality of Kentucky bluegrass

Hockensmith¹,

Marten²,

Halgerson³

1997

Can. J. Plant Sci.

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“…(4)) probably accounts (or much of the ditTerence between the equations deveiopcd bv Reid ct al. (4) and Kane and Moore (3).…”

Section: Discussion'mentioning

confidence: 99%

Studies in the Digestibility of Herbage

Minson

Raymond

Harris

1960

Grass and Forage Science

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This paper presents the results of 125 digestion trials with sheep fed herbage at different stages of growth from three clover-free pure grass swards. During 1958 and 1959, a study was made of the yield, leaf lamina, nitrogen, ash and digestible organic matter percentage (D) of first growths, of regrowths cut at monthly and two monthly intervals and of swards receiving various quantities of fertilizer nitrogen.For first growths in the spring D remained almost constant until the ears started to protrude from the leaf sheaths and then fell rapidly at approximately 0 5 per cent per day. The D values for S 23 ryegrass were three weeks later than S 24 ryegrass, which correspond with later ear emergence of the latter. S 37 cocksfoot was always less digestible than S 24 ryegrass although both were at similar stages of growth. This difference in D also occurred in the regrowths. The D of monthly regrowths tended to fall with each successive cut, although in 1959 ryegrass values improved in the autumn.Fertilizer nitrogen had little effect on D.Despite the warmer spring and drier summer in 1959 and corresponding changes in production per acre there was little effect on D.

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“…A densidade de folhas em plantas forrageiras é uma característica estreitamente ligada à qualidade, em função de que há uma correlação positiva entre a porcentagem de folhas em uma dada espécie e a composição mineral, protéica e digestibilidade da matéria orgânica (Reid et al, 1959). Setária Kazungula e hemártria Roxinha foram as gramíneas que apresentaram maior variação estacional com relação a valor nutritivo e desempenho dos animais, apresentando teores de proteína bruta e DIVMS críticos no outono, período em que ocorreu um acúmulo de talos e material morto nas áreas formadas com essas espécies, sugerindo necessidade de adoção de uma maior pressão de pastejo com as mesmas no verão, e evitando-se desta forma a sobra de material menos digestível para os animais.…”

Section: Ganhos De Peso Por Animalunclassified

Avaliação de sete gramíneas de estação quente para produção de carne nos Campos Gerais do Paraná

Postiglioni¹

2000

Pesq. agropec. bras.

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Com o objetivo de verificar a performance animal, capacidade de suporte e produção de carne no período de três anos, sete gramíneas de estação quente foram avaliadas em sistema de pastejo contínuo, com novilhos mestiços Canchim, na região dos Campos Gerais do Paraná. As espécies estudadas foram hemártria Flórida, hemártria Roxinha, capim-do-nilo, capim IPEAME, setária Kazungula, braquiária Marandu e coastcross-1. O delineamento experimental utilizado foi o de blocos casualizados, com duas repetições, adotando-se a técnica de pastejo put and take. Capim-do-nilo e hemártria Flórida apresentaram maiores valores de DIVMS e proporcionaram os melhores ganhos diários por animal. Hemártria Roxinha proporcionou maior disponibilidade de forragem suportando maior número de animais por unidade de área. Hemártria Flórida, capim-do-nilo e hemártria Roxinha produziram os maiores ganhos de peso vivo por hectare, com produções semelhantes de carne. Exceto hemártria Roxinha e capim IPEAME, todas as gramíneas apresentaram declínio nas produções por unidade de área ao longo dos três anos de estudo.

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Symposium on Forage Evaluation: I. What is Forage Quality from the Animal Standpoint?¹

Cited by 39 publications

References 2 publications

Maturation effects on forage quality of Kentucky bluegrass

Maturation effects on forage quality of Kentucky bluegrass

Studies in the Digestibility of Herbage

Avaliação de sete gramíneas de estação quente para produção de carne nos Campos Gerais do Paraná

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Symposium on Forage Evaluation: I. What is Forage Quality from the Animal Standpoint?1

Cited by 39 publications

References 2 publications

Maturation effects on forage quality of Kentucky bluegrass

Maturation effects on forage quality of Kentucky bluegrass

Studies in the Digestibility of Herbage

Avaliação de sete gramíneas de estação quente para produção de carne nos Campos Gerais do Paraná

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Symposium on Forage Evaluation: I. What is Forage Quality from the Animal Standpoint?¹