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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
06/09/2016 |
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Data da última atualização: |
03/10/2016 |
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Autoria: |
JONES, R. J.; MEGARRITY, R. G. |
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Título: |
Comparative toxicity responses of goats fed on Leucaena leucocephala in Australia and Hawaii. |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 34, n. 6, p. 781-790, 1983. |
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DOI: |
10.1071/AR9830781 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: To examine the apparent absence of toxicity in ruminants fed on Leucaena leucocephala in Hawaii, U.S.A., goats were offered comparable diets of Leucaena and lucerne chaff (control) in both Australia and Hawaii over a 7-week period. Intake of mimosine, excretion of the ruminal metabolite 3-hydroxy- 4(1H)-pyridone (DHP), and serum concentrations of thyroxine (T4) were measured in both studies. Mean mimosine intakes on the highest Leucaena diets in Australia and Hawaii were similar at about 20 g day-1. In Australia, goats on the all-Leucaena diets became hypothyroid after only 3 weeks of feeding, thyroid glands were enlarged and erosion of the oesophageal mucosa and reticulo-rumen occurred. Excretion of DHP in the urine was related to the daily mirnosine intakes, with recoveries of about 86%. In marked contrast, goats fed on Leucaena in Hawaii exhibited no clinical signs of toxicity and excreted less than 1% of the mirnosine intake as DHP in the urine. No degradation of DHP occurred in vitro with rumen fluid from Australian goats, whereas 71% of the added DHP was degraded after 5 h with rumen fluid from goats in Hawaii. The results support the hypothesis that the differences observed are attributable to a different microbial metabolism of mimosine and DHP in ruminants in Hawaii. |
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Thesagro: |
Caprino; Leucaena Leucocephala; Nutrição animal; Toxidez. |
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Thesaurus Nal: |
Goats. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01911naa a2200205 a 4500
001 2052488
005 2016-10-03
008 1983 bl uuuu u00u1 u #d
024 7 $a10.1071/AR9830781$2DOI
100 1 $aJONES, R. J.
245 $aComparative toxicity responses of goats fed on Leucaena leucocephala in Australia and Hawaii.
260 $c1983
520 $aAbstract: To examine the apparent absence of toxicity in ruminants fed on Leucaena leucocephala in Hawaii, U.S.A., goats were offered comparable diets of Leucaena and lucerne chaff (control) in both Australia and Hawaii over a 7-week period. Intake of mimosine, excretion of the ruminal metabolite 3-hydroxy- 4(1H)-pyridone (DHP), and serum concentrations of thyroxine (T4) were measured in both studies. Mean mimosine intakes on the highest Leucaena diets in Australia and Hawaii were similar at about 20 g day-1. In Australia, goats on the all-Leucaena diets became hypothyroid after only 3 weeks of feeding, thyroid glands were enlarged and erosion of the oesophageal mucosa and reticulo-rumen occurred. Excretion of DHP in the urine was related to the daily mirnosine intakes, with recoveries of about 86%. In marked contrast, goats fed on Leucaena in Hawaii exhibited no clinical signs of toxicity and excreted less than 1% of the mirnosine intake as DHP in the urine. No degradation of DHP occurred in vitro with rumen fluid from Australian goats, whereas 71% of the added DHP was degraded after 5 h with rumen fluid from goats in Hawaii. The results support the hypothesis that the differences observed are attributable to a different microbial metabolism of mimosine and DHP in ruminants in Hawaii.
650 $aGoats
650 $aCaprino
650 $aLeucaena Leucocephala
650 $aNutrição animal
650 $aToxidez
700 1 $aMEGARRITY, R. G.
773 $tAustralian Journal of Agricultural Research$gv. 34, n. 6, p. 781-790, 1983.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
05/02/2013 |
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Data da última atualização: |
23/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
CAMPOS, R. V.; COBUCI, J. A.; COSTA, C. N.; BRACCINI NETO, J. |
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Afiliação: |
RAFAEL VIEGAS CAMPOS, UFRS; JAIME ARAUJO COBUCI, UFRS; CLAUDIO NAPOLIS COSTA, CNPGL; JOSÉ BRACCINI NETO, UFRS. |
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Título: |
Genetic parameters for type traits in Holstein cows in Brazil. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia, v. 41, n. 10, p. 2150-2161, 2012. |
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DOI: |
https://doi.org/10.1590/S1516-35982012001000003 |
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Idioma: |
Inglês |
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Conteúdo: |
Data from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, stage of lactation and age of cows at calving (covariate) and random genetic and residual effects. Heritability for type traits ranged from 0.10 to 0.39. The genetic variability in these traits suggested the possibility for moderate genetic gains through selection. The phenotypic correlations were moderated, mainly in the section conformation. Genetic correlations between type traits ranged from -0.44 to 0.85. High genetic correlations indicated that breeding programs could be successful without including all type traits. The selection for the final score at the expense of other traits must be performed with restraint, because in the long term, this may promote undesirable changes in some type traits. |
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Palavras-Chave: |
Correlação genetica; Covariancia de componentes; Gado de leite; REMLF90. |
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Thesagro: |
Hereditariedade; Seleção. |
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Categoria do assunto: |
G Melhoramento Genético |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/948339/1/Genetic-parameters-for-type-traits-in-Holstein-cows-in-Brazil.pdf
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Marc: |
LEADER 01659naa a2200241 a 4500
001 1948339
005 2023-01-23
008 2012 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/S1516-35982012001000003$2DOI
100 1 $aCAMPOS, R. V.
245 $aGenetic parameters for type traits in Holstein cows in Brazil.$h[electronic resource]
260 $c2012
520 $aData from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, stage of lactation and age of cows at calving (covariate) and random genetic and residual effects. Heritability for type traits ranged from 0.10 to 0.39. The genetic variability in these traits suggested the possibility for moderate genetic gains through selection. The phenotypic correlations were moderated, mainly in the section conformation. Genetic correlations between type traits ranged from -0.44 to 0.85. High genetic correlations indicated that breeding programs could be successful without including all type traits. The selection for the final score at the expense of other traits must be performed with restraint, because in the long term, this may promote undesirable changes in some type traits.
650 $aHereditariedade
650 $aSeleção
653 $aCorrelação genetica
653 $aCovariancia de componentes
653 $aGado de leite
653 $aREMLF90
700 1 $aCOBUCI, J. A.
700 1 $aCOSTA, C. N.
700 1 $aBRACCINI NETO, J.
773 $tRevista Brasileira de Zootecnia$gv. 41, n. 10, p. 2150-2161, 2012.
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Embrapa Gado de Leite (CNPGL) |
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