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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
27/08/1999 |
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Data da última atualização: |
27/08/1999 |
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Autoria: |
BADINGA, L.; COLLIER, R. J.; THATCHER, W. W.; WILCOX, C. J. |
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Afiliação: |
University of Florida. |
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Título: |
Effects of climatic and management factors on conception rate of dairy cattle in subtropical environment. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Journal of Dairy Science, v.68, p.78-85, 1985. |
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Volume: |
v.68 |
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Páginas: |
p.78-85 |
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Idioma: |
Inglês |
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Conteúdo: |
Breeding records, representing 12,038 inseminations at Bassett's Dairy Farm (Monticello, FL), were analyzed to document effects of environnmental and management factors on fertility of dairy cattle from January 1, 1975 to December 31, 1977. Conception rates of lactating cows decreased sharply when maximum air temperature on day after insemination exceeded 30 graus C. In contrast, conception rates for heifers did not decline until 35 graus C. Virgin heifers had higher conception rates for all services (50%) than lactating cows (34%) and suffered only slight depression on fertility during summer months. Heifers required 1.5 services per conception compared with 2.3 for lactating cows. Relationship between conception rate and rainfall on day after insemination was negative and curvilinear. Jerseys had higher conception rates (45%) than Holstein (39%) and Brown Swiss (41%). Services per conception were 1.7, 2.0, and 1.9. Substantial decreases of fertility were associated with advancing service number. Estrous status (standing; positive heat detection patch; mounting activity), inseminator, and year of service were related to variation of conception rate. Seasonal effects on fertility of lactating cows were marked. Thus, environmental management of the postpartum cow during hot summer months is warranted to maximize fertility. |
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Palavras-Chave: |
Gado de leite. |
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Thesagro: |
Bioclimatologia; Reprodução. |
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Thesaurus Nal: |
bioclimatology; dairy cattle; reproduction. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02039naa a2200253 a 4500
001 1079939
005 1999-08-27
008 1985 bl --- 0-- u #d
100 1 $aBADINGA, L.
245 $aEffects of climatic and management factors on conception rate of dairy cattle in subtropical environment.
260 $c1985
300 $ap.78-85 v.68
490 $vv.68
520 $aBreeding records, representing 12,038 inseminations at Bassett's Dairy Farm (Monticello, FL), were analyzed to document effects of environnmental and management factors on fertility of dairy cattle from January 1, 1975 to December 31, 1977. Conception rates of lactating cows decreased sharply when maximum air temperature on day after insemination exceeded 30 graus C. In contrast, conception rates for heifers did not decline until 35 graus C. Virgin heifers had higher conception rates for all services (50%) than lactating cows (34%) and suffered only slight depression on fertility during summer months. Heifers required 1.5 services per conception compared with 2.3 for lactating cows. Relationship between conception rate and rainfall on day after insemination was negative and curvilinear. Jerseys had higher conception rates (45%) than Holstein (39%) and Brown Swiss (41%). Services per conception were 1.7, 2.0, and 1.9. Substantial decreases of fertility were associated with advancing service number. Estrous status (standing; positive heat detection patch; mounting activity), inseminator, and year of service were related to variation of conception rate. Seasonal effects on fertility of lactating cows were marked. Thus, environmental management of the postpartum cow during hot summer months is warranted to maximize fertility.
650 $abioclimatology
650 $adairy cattle
650 $areproduction
650 $aBioclimatologia
650 $aReprodução
653 $aGado de leite
700 1 $aCOLLIER, R. J.
700 1 $aTHATCHER, W. W.
700 1 $aWILCOX, C. J.
773 $tJournal of Dairy Science$gv.68, p.78-85, 1985.
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Registro original: |
Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
30/11/2022 |
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Data da última atualização: |
22/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
MARTINS, M. A.; MATTOSO, L. H. C. |
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Afiliação: |
MARIA ALICE MARTINS, CNPDIA; LUIZ HENRIQUE CAPPARELLI MATTOSO, CNPDIA. |
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Título: |
Manufacture and performance of peanut skin cellulose nanocrystals. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Scientia Agricola, v. 79, n. 6, e20210010, 2022. |
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Páginas: |
10 p. |
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ISSN: |
1678-992X |
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DOI: |
http://doi.org/10.1590/1678-992X-2021-0010 |
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Idioma: |
Inglês |
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Conteúdo: |
Due to their remarkable characteristics, cellulose nanocrystals are strategic materials that has various industrial applications, and are capable of being produced from vegetable fibers derived from the discards of agricultural practices. Peanut (Arachis hypogaea L.)peel is a residue considered of low commercial value and high polluting potential that needs new applications in order to mitigate these problems. Thus, in this study the feasibility of extracting cellulose nanocrystals was investigated. Two chemical routes were followed for this extraction. In the first, the fibers were bleached before acid hydrolysis whereas mercerization was used in the second. The second route was more efficient, as it enabled the elimination of proteins and phenolic compounds, which could be confirmed through solid-state 13 C nuclear magnetic resonance (NMR) that revealed no signs of lignin residues. The cellulose nanocrystals composed of mainly type I cellulose presented a high degree of crystallinity index, 75 %, a thermal stability up to 200 °C, considerable stability in suspension (zeta potential of ?48.1 ± 2.1 mV), and an aspect ratio of 125. They represent options that could add value to this residue, which would ease environmental problems. |
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Palavras-Chave: |
Agricultural residue; Waste. |
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Categoria do assunto: |
-- |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1149008/1/P-Manufacture-and-performance-of-peanut-skin-cellulose-nanocrystals.pdf
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Marc: |
LEADER 01819naa a2200193 a 4500
001 2149008
005 2024-01-22
008 2022 bl uuuu u00u1 u #d
022 $a1678-992X
024 7 $ahttp://doi.org/10.1590/1678-992X-2021-0010$2DOI
100 1 $aMARTINS, M. A.
245 $aManufacture and performance of peanut skin cellulose nanocrystals.$h[electronic resource]
260 $c2022
300 $a10 p.
520 $aDue to their remarkable characteristics, cellulose nanocrystals are strategic materials that has various industrial applications, and are capable of being produced from vegetable fibers derived from the discards of agricultural practices. Peanut (Arachis hypogaea L.)peel is a residue considered of low commercial value and high polluting potential that needs new applications in order to mitigate these problems. Thus, in this study the feasibility of extracting cellulose nanocrystals was investigated. Two chemical routes were followed for this extraction. In the first, the fibers were bleached before acid hydrolysis whereas mercerization was used in the second. The second route was more efficient, as it enabled the elimination of proteins and phenolic compounds, which could be confirmed through solid-state 13 C nuclear magnetic resonance (NMR) that revealed no signs of lignin residues. The cellulose nanocrystals composed of mainly type I cellulose presented a high degree of crystallinity index, 75 %, a thermal stability up to 200 °C, considerable stability in suspension (zeta potential of ?48.1 ± 2.1 mV), and an aspect ratio of 125. They represent options that could add value to this residue, which would ease environmental problems.
653 $aAgricultural residue
653 $aWaste
700 1 $aMATTOSO, L. H. C.
773 $tScientia Agricola$gv. 79, n. 6, e20210010, 2022.
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Embrapa Instrumentação (CNPDIA) |
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