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  • 1
    Online Resource
    Online Resource
    Efeito do estresse térmico por calor na produção de vacas leiteiras
    Revista Cientifica Pesquisa Agropecuaria Gaucha (PAG) ; 2020
    In:  Pesquisa Agropecuária Gaúcha Vol. 26, No. 1 ( 2020-10-21), p. 288-311
    Details
    In: Pesquisa Agropecuária Gaúcha, Revista Cientifica Pesquisa Agropecuaria Gaucha (PAG), Vol. 26, No. 1 ( 2020-10-21), p. 288-311
    Abstract: Cerca de dois terços do território nacional está situado na faixa tropical do planeta, onde predomina elevada temperatura e radiação solar, podendo ultrapassar a zona de conforto dos animais, levando ao estresse térmico, e consequentemente afetando a produção e a qualidade do leite, principalmente em vacas de alta produção, devido a serem mais sensíveis ao calor e terem maior dificuldade em dissipá-lo. Assim, o objetivo dessa revisão foi abordar os principais impactos relacionados ao estresse térmico na produção de leite e alguns fatores que podem ser utilizados para minimizar essas condições. Para controlar os efeitos do estresse térmico o produtor pode fazer uso de algumas estratégias de manejo ambiental, nutricional e sistema de resfriamento. O uso de alguns métodos como o sombreamento natural e artificial, dieta com menor incremento calórico, e uso de sistemas como ventilador, aspersor e painel evaporativo podem se mostrar eficientes para animais que estão submetidos ao calor. Desde modo, conclui-se que o estresse térmico causa vários problemas aos rebanhos leiteiros e quando identificado, podemos controlar seus efeitos e minimizar as perdas econômicas. Vários métodos para controlar o efeito do estresse térmico se mostraram eficientes, porém a escolha do método adequado depende do seu custo benefício e das características especificas de cada propriedade.
    Type of Medium: Online Resource
    ISSN: 2595-7686 , 0104-9070
    URL: Article
    DOI: 10.36812/pag.2020261288-311
    Language: Unknown
    Publisher: Revista Cientifica Pesquisa Agropecuaria Gaucha (PAG)
    Publication Date: 2020
    detail.hit.zdb_id: 2735317-5
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  • 2
    Online Resource
    Online Resource
    Qualidade e composição química da carne de bovinos de corte inteiros ou castrados de diferentes grupos genéticos Charolês x Nelore
    FapUNIFESP (SciELO) ; 2001
    In:  Revista Brasileira de Zootecnia Vol. 30, No. 2 ( 2001-04), p. 518-525
    Details
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 30, No. 2 ( 2001-04), p. 518-525
    Abstract: Seventy beef males of three breeding systems (BS), straightbreds Charolais (Ch) and Nellore (Ne), G1 crossbreds: 1/2 Ch + 1/2 Ne (1/2 Ch) and 1/2 Ne + 1/2 Ch (1/2 Ne) and G2 crossbreds: 3/4 Ch + 1/4 Ne (3/4 Ch) and 3/4 Ne + 1/4 Ch (3/4 Ne) were used. The number of animals by genetic group was, respectively, 15, 12, 8, 12, 14 and 9. Thirty-five males were castrated (C) at seven months and 35 were kept intact (I). The animals were feedlot finished from 20 to 24 months. The longissimus dorsi muscle was used for the meat evaluation. No significant interaction was observed between genetic composition and sexual condition, for the variables studied. The I males displayed meat with darker color (3.05 vs. 3.78 points) with less amount of marbling (4.26 vs. 5.75 points) and less amount of ether extract (1.73 vs. 2.88%). However they presented larger (66.03 vs. 60.50 cm²) longissimus dorsi area and meat with better palatability, juiciness and tenderness. Ch animals had larger longissimus dorsi than the Ne. In the G1 group, the 1/2 Ch meat showed larger amount of marbling and ether extract and less cooking losses than the 1/2 Ne meat. Between G2 animals, the 3/4 Ne showed meat with larger thawing losses and larger amount of ether extract. In G1 animals meat, the heterosis level reached 18.54% for longissimus dorsi area, 28.10% for ether extract and 64.01% for amount of marbling. In G2, the heterosis was -17.30% for lean texture and 10.40% for longissimus dorsi area.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    URL: Article
    DOI: 10.1590/S1516-35982001000200031
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2001
    detail.hit.zdb_id: 2078814-9
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  • 3
    Online Resource
    Online Resource
    Avaliação da silagem de diferentes híbridos de milho (Zea mays, L.) por meio do desempenho de bezerros confinados em fase de crescimento
    FapUNIFESP (SciELO) ; 2004
    In:  Revista Brasileira de Zootecnia Vol. 33, No. 4 ( 2004-08), p. 1016-1028
    Details
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 33, No. 4 ( 2004-08), p. 1016-1028
    Abstract: The objective of the experiment was to evaluate, through feedlot performance of calves, three corn hybrids (Zea mays, L.): Agroceres AG-5011, Braskalb XL-344 and Cargill C-806. For the evaluation, 27 Nellore x Charolais non-castrated crossbred males with average age of 10 months and average initial weight of 252 kg, were used. The animals were fed during 84 days, divided in four periods of 21 days. The hybrids silages tested represented 70% of the dry matter offered. No significant interaction of corn hybrids with evaluation period was observed for the different parameters. The diet that included the AG-5011, resulted in higher voluntary dry matter intake expressed per 100 kg of live weight and metabolic size, and higher average daily intake of ADF expressed in the different forms, in relation to XL-344 and C-806, which were similar to each other. The diets that included the AG-5011, XL-344 and C-806 silages showed similar dry matter intakes expressed as kg/animal/day (6.73; 6.05; and 6.19), NDF expressed as kg/animal/day (3.054; 2.837; and 2.836) and digestible energy expressed in the different forms, average daily weight gain (1.283; 1.219; and 1.249 kg), gain in body condition, feed conversion (5.26; 4.98; and 4.97) and energy efficiency (14.02; 13.68; and 13.21). The three hybrids are indicated as very good genetic materials for silage production, resulting in weight gain above 1.2 kg/animal/day when fed diets with roughage:concentrate ratio of 70:30.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    URL: Article
    DOI: 10.1590/S1516-35982004000400022
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2004
    detail.hit.zdb_id: 2078814-9
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  • 4
    Online Resource
    Online Resource
    Componentes não-integrantes da carcaça de novilhos jovens e superjovens terminados em confinamento
    Universidade Estadual de Maringa ; 2009
    In:  Acta Scientiarum. Animal Sciences Vol. 31, No. 1 ( 2009-05-22)
    Details
    In: Acta Scientiarum. Animal Sciences, Universidade Estadual de Maringa, Vol. 31, No. 1 ( 2009-05-22)
    Type of Medium: Online Resource
    ISSN: 1807-8672 , 1806-2636
    URL: Article
    DOI: 10.4025/actascianimsci.v31i1.542
    Language: Unknown
    Publisher: Universidade Estadual de Maringa
    Publication Date: 2009
    detail.hit.zdb_id: 2555935-7
    SSG: 7,36
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  • 5
    Online Resource
    Online Resource
    Perfil lipídico da gordura intramuscular de cortes e marcas comerciais de carne bovina
    FapUNIFESP (SciELO) ; 2011
    In:  Revista Brasileira de Zootecnia Vol. 40, No. 5 ( 2011-05), p. 1134-1142
    Details
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 40, No. 5 ( 2011-05), p. 1134-1142
    Abstract: The objective of this work was to characterize the intramuscular fat of short loin, ramp loin and rib and six commercial brands (A, B, C, D, E and F) of beef commercialized in Porto Alegre, Rio Grande do Sul. Samples were collected from a supermarket chain. The brands A and B were associated with British animals breeds, the brands C and D were from European animals breeds produced in conventional and organic system, respectively, from Uruguay, while the brands E and F were derived from non specific breed and unidentified feeding system, obtained in a slaughterhouse and a regional chain of supermarkets, respectively. The samples were deboned, ground, vacuum packed and stored in cooling temperature until the moment of analysis. In each sample were extracted lipids and fatty acids were identified. The experimental design was a completely randomized, with a 6 × 3 factorial arrangement and analyzed by the GLM procedure of SAS computing application. Regarding lipid profile no significant interaction were found among cuts and brands of commercial cuts. The lipid percentage was 0.95; 3.01 and 0.97% in short loin, ribs and ramp loin cuts. Rib presented the greatest percentage of saturated fatty acids (FA) and the greatest estimate of D9 desaturase from C16:0 and C18:0. The highest percentage of C18:2 cis-9, trans 11, conjugated linoleic acid, CLA, n-6 and n-3 was found in ramp loin. Brand F showed a higher degree of saturation, while the brand D showed higher polyunsaturated fatty acids, polyunsaturated/saturated ratio and trans18 and the lowest saturated fatty acids. There was a significant interaction between cuts and brands for the content of CLA, with the highest content found in the short loin of brand F. The characteristics of intramuscular beef fat depending on the cuts and the commercial brands.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    URL: Article
    DOI: 10.1590/S1516-35982011000500027
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2011
    detail.hit.zdb_id: 2078814-9
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  • 6
    Online Resource
    Online Resource
    Simulation of the financial impact caused by different pregnancy rate in a beef cattle system : Simulação do impacto financeiro ocasionado pelas diferentes taxas de prenhez em um sistema de cria de bovinocultura de corte
    Uniao Atlantica de Pesquisadores ; 2023
    In:  Concilium Vol. 23, No. 8 ( 2023-05-16), p. 203-222
    Details
    In: Concilium, Uniao Atlantica de Pesquisadores, Vol. 23, No. 8 ( 2023-05-16), p. 203-222
    Abstract: The objective of this study was to develop a simulation model for a beef cattle system, in order to carry out an economic analysis of the variable costs influenced by the use of technologies that aim to increase the pregnancy rate of this system and thus, to show whether the Pregnancy rates resulting from a greater intensification of the system coincide with the best economic responses, among the evaluated scenarios. The results were obtained through the elaboration of herd evolutions with different pregnancy rates and cost/animal analysis of each technology used in the system (early weaning, temporary weaning and improved native pasture), aiming at obtaining the enjoyment and variable costs in different scenarios, in order to compare and describe the data. The variation in the pregnancy rate indicated different values for the enjoyment of the system, from 65 to 85%, corresponding to 100 and 116 kg/ha/year, respectively, while the pregnancy rates of 90 and 95% reflected approximate values of 113 and 112 kg/ha/year, respectively. It is concluded that the highest pregnancy rates did not coincide with the highest economic result.
    Type of Medium: Online Resource
    ISSN: 0010-5236
    URL: Article
    DOI: 10.53660/CLM-1253-23E33
    Language: Unknown
    Publisher: Uniao Atlantica de Pesquisadores
    Publication Date: 2023
    SSG: 1
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  • 7
    Online Resource
    Online Resource
    Perfil de ácidos graxos e qualidade da carne de vacas de descarte terminadas em confinamento recebendo dietas com ou sem adição de monensina
    FapUNIFESP (SciELO) ; 2006
    In:  Ciência Rural Vol. 36, No. 5 ( 2006-10), p. 1518-1523
    Details
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 36, No. 5 ( 2006-10), p. 1518-1523
    Abstract: The marbling fatty acid profile and the meat quality of cull cows feedlot finished receiving diets without or with sodic monensin (200mg animal-1 day-1) were evaluated. The diet contained 12.5% of crude protein and 2.99 Mcal of digestible energy kg-1 of dry matter, composed of 48% of roughage (corn silage) and 52% of concentrate. The monensin presence didn’t have significant effect on the color, texture and marbling, presenting medium values of 3.55, 3.29 and 6.38 points, respectively. Concerning the sensorial characteristics, the meat of the animals fed with monensin it demonstrated to be less palatable (P 〈 .10). The monensin inclusion caused the increase (P 〈 .10) of the participation of saturated fatty acids and reduction of the unsaturated in the fat intramuscular of the Longissimus dorsi. Among the fatty acids saturated, the use of monensin increased heptadecanóico (17:0) proportion and, among the unsaturated group, the trans isomer (C18:1 n9t) increased, and the cis isomer of oleate (C18:1 n9c) decreased (P 〈 .10). The monounsaturated fatty acids proportion was reduced by monensin inclusion (P 〈 .10). Monensin addition decreased the meat quality by decrease its palatability of the meat of cull cows. As regards the profile of fatty acids total, the monensin provides larger participation of saturated fatty acid in detriments to the unsaturated in the fat marbling of the muscle Longissimus dorsi.
    Type of Medium: Online Resource
    ISSN: 0103-8478
    URL: Article
    DOI: 10.1590/S0103-84782006000500027
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2006
    detail.hit.zdb_id: 2025834-3
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  • 8
    Online Resource
    Online Resource
    Desempenho de vacas de descarte recebendo dietas com ou sem monensina
    FapUNIFESP (SciELO) ; 2008
    In:  Ciência Rural Vol. 38, No. 1 ( 2008-02), p. 173-177
    Details
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 38, No. 1 ( 2008-02), p. 173-177
    Abstract: The feedlot performance of beef cull cows receiving diets without or with monensin (200mg animal-1 day-1), was evaluated. The diet, 48% of roughage and 52% of concentrated, contained 12.5% of crude protein and 2.99Mcal of digestible energy kg-1 of dry matter. The intake of dry matter and digestible energy was reduced 20.9% with the presence of monensin in the diet. The reduction in digestible energy intake by the animals fed with monensin affected negatively their performance, causing a decrease of 22.6% in their weight gain. With higher food intake and consequently superior performance, the control animals presented higher live weight at slaughter (527.49 vs 498.00kg), being 5.8% heavier in relation to the animals fed with monensin. The feed:gain ratio and energy efficiency, were not affected significantly by the presence of monensin in the diet (being the averages 7.78 and 23.24, respectively). The presence of monensin in diet resulted in reductions of dry matter intake and weight gain, however, it did not alter the feed:gain ratio.
    Type of Medium: Online Resource
    ISSN: 0103-8478
    URL: Article
    DOI: 10.1590/S0103-84782008000100028
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2008
    detail.hit.zdb_id: 2025834-3
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  • 9
    Online Resource
    Online Resource
    Perfil de ácidos graxos na carne de novilhos de diferentes idades e grupos genéticos terminados em confinamento
    FapUNIFESP (SciELO) ; 2009
    In:  Revista Brasileira de Zootecnia Vol. 38, No. 3 ( 2009-03), p. 523-531
    Details
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 38, No. 3 ( 2009-03), p. 523-531
    Abstract: For the conduction of this work, 24 males from four different genetic groups (⅝Charolais (CH) ⅜Nellore (NE); ⅝NE ⅜CH; ¾CH ¼NE e ¾NE ¼CH) and two ages: steers and young steers were used. The animals received a diet composed of corn silage and concentrate with roughage:concentrate ratio of 50:50. After slaughter, the carcasses were identified and⅝ chilled. A steak from the longissimus muscle was collected and dried in stove, grounded, identified and stored for lipid extraction. The fatty acids (FA) determination was performed through gas chromatograph. No significant interaction was observed between category and genetic groups and marbling, fat thickness, muscle:fat ratio, used as co-variables. The total trans18 FA was higher (2.46%) for young steers in relation to steers (1.87%). Most short-chain (75%) and medium-chain (91.7%) FA were not influenced by the genetic group. CLA values did not differ between CH-NE crossbred animals. Animals with NE predominance showed higher saturated FA (average of 54.7%) in relation to CH animals (average of 49.5%). In relation to the unsaturated/saturated ratio, higher value was observed for CH animals.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    URL: Article
    DOI: 10.1590/S1516-35982009000300018
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2009
    detail.hit.zdb_id: 2078814-9
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  • 10
    Online Resource
    Online Resource
    Ganho de peso antes e após os sete meses no desenvolvimento e características quantitativas da carcaça de novilhos Nelore abatidos aos dois anos
    FapUNIFESP (SciELO) ; 2004
    In:  Revista Brasileira de Zootecnia Vol. 33, No. 4 ( 2004-08), p. 1029-1038
    Details
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 33, No. 4 ( 2004-08), p. 1029-1038
    Abstract: The objective of the experiment was to study the development and carcass characteristics of Nellore steers, slaughtered at two years of age classified in four groups according to the average daily weight gain (ADG) pre and post seven months: high-high = steers with ADG ³ .44 kg from birth to slaughter, low-low = steers with ADG 〈 .44 kg from birth to slaughter, high-low = steers with ADG 〉 .44 kg before seven months, and ADG 〈 .44 kg from seven months to slaughter, and low-high = animals with ADG 〈 .44 kg before seven months and ADG ³ .44 kg from seven months to slaughter. At seven months, the animals with lower weight gain (low-high and low-low) showed, in average, 109 kg versus 154 kg for high-low and high-high steers. High-high and high-low animals showed higher live weight at 18 months than the other groups, but at slaughter high-high (396 kg) and high-low (382 kg) steers were only heavier than low-low (335 kg) steers, the same was verified with the carcass weight, wich was 221, 207 and 182 kg, in the same order. Sidecut percentage was higher for high-high steers (13.8%) than low-high (12.7%) and low-low (12.1%) steers, but sawcut percentage was lower for high-high (48.4%) than low-low (50.2%) steers. Contrast analysis comparing pre and post seven months ADG, showed that only pre seven months ADG effect was important for characteristics like weight at twelve and eighteen moths, subcutaneous fat thickness, sidecut percentage, carcass length and leg length. Both effects, ADG pre and post seven months, affected slaughter and carcass weight, sawcut percentage and arm length.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    URL: Article
    DOI: 10.1590/S1516-35982004000400023
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2004
    detail.hit.zdb_id: 2078814-9
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