Consulta: subjectFacets:"Heifers"
Registros recuperados: 14
Data/hora: 01/06/2024 12:13:12

Composición de la dieta y conducta del pastoreo de terneras (Bos taurus x Bos indicus) en un sitio con vegetación secundaria en el norte de Veracruz
Provedor de dados: 32
Autores: Velázquez Martínez, Mauricio.
Se estudió el comportamiento del pastoreo, selección de la dieta y ganancia de  peso de terneras (sin y con modelos sociales) en un sitio con alta diversidad de  especies de plantas. El estudio se llevo acabo en un ecosistema tropical que  contenía una mezcla de zacates, herbáceas hoja ancha, vegetación leñosa y  semileñosa. Diez terneras Bos taurus x Bos indicus (6 a 8 meses de edad) fueron  asignadas aleatoriamente a uno de dos tratamientos: terneras sin experiencia  (T1; n=5) con peso de 131.4 ± 14.1 kg, y terneras sin experiencia (T2; n=5) con  peso de 129.6 ± 6.4 kg acompañadas por dos modelos sociales (16 meses de  edad) con peso de 153.3 ± 4.1. Cada grupo de animales pastorearon en potreros  separados durante un periodo de 12 semanas, y los animales...
Tipo: Tesis
Palavras-chave: Terneras; Comportamiento del pastoreo; Selección de dieta; Ganancia de peso; Diversidad de plantas; Maestría; Ganadería; Heifers; Foraging behavior; Diet selection; Weight gain; Plant diversity.
Ano: 2008
URL: http://hdl.handle.net/10521/1413

Aislamiento e identificación de bacterias ácido lácticas con potencial probiótico en bovinos Holstein.
Provedor de dados: 32
Autores: Caballero Cervantes, Yesenia.
El principal problema de salud en becerras de reemplazo son las diarreas provocadas por Escherichia coli enterotóxica. El uso de microorganismos pertenecientes al grupo de bacterias ácido lácticas (BAL) en la etapa de lactancia es benéfico para combatir la incidencia de diarreas e incrementar la ganancia de peso. Sin embargo, se ha reportado inconsistencia en los efectos benéficos de los productos comerciales. Por lo anterior, el objetivo de este estudio fue aislar y seleccionar BAL con potencial probiótico de mucosa oral de becerros lactantes, calostro y leche de vacas Holstein que puedan ser consideradas para el suministro de becerras en México. Para ello, se realizó el aislamiento en caldo Man Rogosa Sharp (MRS) y en agar MRS para la obtención de...
Palavras-chave: Becerras; Lactobacillus; Cepas; Resistencia; Heifers; Strains; Resistance; Ganadería; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2358

Análise do potencial mercadológico da carne de vitelo pantaneiro em Corumbá, MS.
Provedor de dados: 14
Autores: ROCHA, D. H. C.; LARA, J. A. F.; SERENO, J. R. B.
bitstream/CPAC-2009/27864/1/p2006_77.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Agronegócio; Bovino; Bezerro; Carne; Mercado.; Agribusiness; Beef cattle; Heifers; Markets.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570305

Estratégias para aumento da eficiência reprodutiva e produtiva em bovinos de corte.
Provedor de dados: 14
Autores: VALLE, E. R. do; ANDREOTTI, R.; THIAGO, L. R. L. de S.
Na pecuária de corte, a exploração comercial do sistema de cria se constitui na fase do sistema produtivo, que envolve a criação e o manejo não só das matrizes bovinas e seus respectivos bezerros ate a desmama, mas também das novilhas de reposição e dos touros. Esse sistema tem por objetivo a produção de bezerros desmamados que representa a maior fonte de receita do criador. A venda de vacas descartadas e outros animais, apesar de contribuírem para a produção total, e uma fonte de receita marginal. Portanto, a viabilidade do sistema vai depender da eficácia e eficiência com que são utilizados os meios disponíveis para a otimização da produtividade. O escopo deste trabalho foi o de apresentar e discutir as principais praticas de manejo reprodutivo, que...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Bovino de corte; Estacao de monta; Novilha; Sanidade; Eficiência; Calf; Health; Management; Production.; Acasalamento; Bezerro; Desmama; Manejo; Reprodução; Produção; Vaca.; Touro; Beef cattle; Bulls; Heifers; Copulation; Cows; Reproduction; Reproductive performance; Weaning.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/321581

Value of Minimum Sire Accuracy Traits in Bred Heifer Price
Provedor de dados: 31
Autores: Rees,   Lisa; Parcell,   Joseph L.; Patterson,   David J.
The product life cycle of the new value added marketing strategy that a quality heifer program created in adding, a new product (heifers with additional value characteristics) is explored.  The new product that will be examined is related to the Show-Me Select Heifer Replacement program.  The Tier II program has essentially created a new product (higher quality bred heifers) by using minimum EPD accuracies for calving ease along with expected calf and carcass performance measurements.  The hedonic study shows that that the Tier II heifers receive a premium compared to traditional Show-Me-Select heifers.  The first year Tier II heifers came on the market in 2008 they received a discount of $24 as compared to regular Show-Me-Select Heifers.  However, the...
Tipo: Conference Paper or Presentation
Palavras-chave: Value Added; Life Cycle; Heifers; Cattle; Hedonic; EPD; Demand and Price Analysis; Farm Management.
Ano: 2011
URL: http://purl.umn.edu/103880

Determining the Variation in Certified Preconditioning Premiums for Heifers and Steer
Provedor de dados: 31
Autores: Schumacher,   Stephanie; Peel,   Derrell S.
This study applies separate hedonic models to Oklahoma Quality Beef Network data to determine differences in the value of preconditioning premiums for steers versus heifers.  Results indicate that preconditioning values are generally lower for heifers but exceed steer premiums at higher weights.  Separate treatment of steers and heifers is validated.
Tipo: Presentation
Palavras-chave: Preconditioning; Steers; Heifers; Marketing.
Ano: 2012
URL: http://purl.umn.edu/119722

Influence of weaning age on the reproductive efficiency of primiparous cows
Provedor de dados: 96
Autores: Vaz,Ricardo Zambarda; Lobato,José Fernando Piva; Restle,João.
The effects of weaning age (90 days or 156 days) of female beef calves were evaluated on their subsequent performance from the beginning of the first pregnancy and the end of the second breeding season, at 22/24 months of age. During pregnancy, heifers were managed as a single group on Brachiaria brizantha cv. Marandu pasture; after calving, on bristle oats (Avena strigosa Schreb) and ryegrass (Lolium multiflorum Lam.); and on Brachiaria humidicula pasture during the second reproductive period. The characteristics studied were not influenced by calf weaning age. Heifers submitted to early or conventional weaning weighed 354.5 and 351.9 kg in the post-calving, and 363.4 and 359.2 kg when they weaned their calves. Average daily gain during the breeding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body condition; Early weaning; Heifers; Pregnancy rate; Weaning age; Weight gain.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000200011

Energy sources and supplementation levels for beef heifers raised during the dry season
Provedor de dados: 96
Autores: Couto,Victor Rezende Moreira; Paulino,Mário Fonseca; Detmann,Edenio; Valadares Filho,Sebastião de Campos; Sales,Maykel Franklin Lima; Barros,Lívia Vieira de; Porto,Marlos Oliveira; Valente,Ériton Egidio Lisboa.
This experiment aimed at evaluating the productive performance, intake and the apparent digestibility in the raising of beef heifers on Brachiaria decumbens Stapf. pastures under supplementation with starch or fibrous energy sources during the dry season. It was used 40 newly weaned heifers (20 Nellore and 20 crossbreed), at 8.5 months of age and 197.9 ± 3.74 kg initial weight. Two supplements were formulated: the first was corn meal- and soybean meal-based diet (high in starch) and the second was based on wheat meal (high in fiber), which were given at the quantities of 0.5 or 1.0 kg/animal/day, compared to the offer of only mineral mixture (control). The animals were distributed according to a complete randomized block design in a 2 × 2 + 1 factorial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria decumbens; Heifers; Pasture; Wheat meal.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100024

Protein requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios
Provedor de dados: 96
Autores: Souza,Evaristo Jorge Oliveira de; Valadares Filho,Sebastião de Campos; Guim,Adriana; Valadares,Rilene Ferreira Diniz; Marcondes,Marcos Inácio; Ferreira,Marcelo de Andrade; Prados,Laura Franco; Benedeti,Pedro del Bianco.
This study aimed to determine the protein requirements for females of Nellore, F1 Nellore × Angus and F1 Nellore × Simmental fed on two concentrate levels (30 and 50%). Sixty heifers from three genetic groups with 18 months of age were used: 20 Nellore, 20 Nellore × Angus and 20 Nellore × Simmental. Twelve heifers of the reference group (four of each genetic group) were slaughtered at the beginning of the experiment. Another 12 heifers (four of each genetic group) were fed on the level of maintenance and 36 heifers (12 animals of each genetic group) were kept in power system ad libitum with 30% (six of each group) or 50% (six of each group) dietary dry matter in concentrate. Heifers were randomly assigned to six treatments in a 3 × 2 factorial arrangement...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crossbred; Heifers; Metabolizable protein and net protein.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300040

The effect of feed supplementation on the onset of puberty in Brazilian dairy heifers
Provedor de dados: 63
Autores: Meirelles,C.F.; Abdalla,A.L.; Vitti,D.M.S.S.
Most Brazilian dairy production is conducted by small holders whose general management skills and feeding programs are often deficient. One common problem directly attributed to underfeeding is that heifers rarely reach sexual maturity before 15 months of age. Groups of growing heifers were treated to detect the effects of protein supplementation and antihelmintic treatment on sexual maturity. The first ovulation occurred at 513 ± 44 and 573 ± 36 days (P&lt;.01) in supplemented and control groups, respectively. Liveweight gains from start of the trial to the first ovulation were 378 ±.02 and 331 ±.04 g for suplemented (S) and control (C) groups. Only 52.17 % of heifers in C group (11 of 23) but 95.65 % in S group (22 of 23) reached sexual maturity before...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heifers; Puberty; Protein supplementation; Antihelmintic.
Ano: 1994
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000200026

Virginiamycin and sodium monensin supplementation for beef cattle on pasture
Provedor de dados: 45
Autores: Maciel,I.C.F.; Saturnino,H.M.; Barbosa,F.A.; Malacco,V.M.R.; Andrade Júnior,J.M.C.; Maia Filho,G.H.B.; Costa,P.M.
ABSTRACT The aim of this paper was to evaluate the effects of including virginiamycin (VM), sodium monensin (MON) or the association (VM+MON) in the energetic mineral supplement, on the intake and performance of beef cattle on pasture. Forty Nellore heifers with 24 months of age and initial body weight (BW) of 251.5±16.6kg, were distributed in four treatments in a randomized block design. Treatments consisted of adding VM, MON or VM+MON to the supplement (CONT). Additive concentrations were defined to reach a dose of 40 to 45mg/100kg BW. The herbage allowance was not a limiting factor for the animals’ intake. Supplement intake was lower than expected, with 33.0, 18.8 and 26.3mg per 100kg BW for VM, MON and VM+MON, respectively. Dry matter intake (DMI,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additives; Heifers; Intake; Ionophores; Performance.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000601999

Spatial distribution of dairy heifers’ dung in silvopastoral systems
Provedor de dados: 65
Autores: Carnevalli,Roberta Aparecida; Mello,Andrea Cristina Tavares de; Shozo,Luciano; Crestani,Steben; Coletti,Admar Junior; Eckstein,Camila.
ABSTRACT:  Ruminants vary their walking trajectory according to the positioning of the trees in integrated systems, which can determine the concentration of dung deposition at certain locations. The aim of this study was to map the distribution of feces and the behavior of dairy heifers in sunny and shaded areas. This experiment was carried out in Mato Grosso, Brazil, where the main grazing conditioner is shade due to the presence of trees in the pastures. Shading levels used were: full sunlight (control), moderate shade (338 trees ha−1) and intensive shade (714 trees ha−1) in randomized complete blocks. The experimental period was divided into three evaluation periods based on rainfall distribution: rainy period = December 2012; transition period = March...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pasture litter; Feces patches; Shade; Heifers.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001000651

Induction of lactation: an economic study of tool for dairy heifers with successive reproductive failures
Provedor de dados: 65
Autores: Maffi,Andressa Stein; Luz,Gabriela Bueno; Gasperin,Bernardo Garziera; Mattos,Raine Fonseca; Xavier,Eduardo Gularte; Corrêa,Marcio Nunes; Brauner,Cássio Cassal.
ABSTRACT:  The aim of this study was to evaluate the economic viability of the use of a lactation induction protocol in Holstein heifers. Were collected data of nutritional, reproductive and sanitary management pre and post-lactation period from 30 induction heifers (IG) and 30 pregnant heifers (CG). All animals were inseminated around 14 months of age and started lactation at 23±4 months. The animals of IG were heifers do not pregnant after two inseminations and natural service e were induced to lactation according to protocol: from the 1st to the 8th day, 30 mg of estradiol benzoate were administered daily, together with 300 mg of progesterone. From the 9th until the 14th, animals only received daily doses of 20 mg estradiol benzoate. On 16th day, 0.56...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Economic viability; Heifers; Induced lactation.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200701

Vegetation composition and forage mass in grassland with a double structure under two winter grazing regimes
Provedor de dados: 65
Autores: Coelho,André Alfredo; Trindade,José Pedro Pereira; Volk,Leandro Bochi da Silva; Pinheiro,Clodoaldo Leites; Quadros,Fernando Luiz Ferreira de.
ABSTRACT:  Remnant areas of Pampas grassland have a distinct double structure. Efficiency of livestock farming on these grasslands depends on practices that are synchronized with natural variation. This study examined the changes in vegetation composition and forage mass during winter to understand the effects of grazing methods in a natural pasture with a double structure that was grazed by heifers. An experimental area in the municipality of Bagé, Rio Grande do Sul, was subjected to continuous or rotational grazing treatments, with two replicates each. Frequency of the structural composition and forage mass of the lower stratum and animal weight was measured at the beginning and end of the experimental period (June 7 to October 7, 2016, respectively)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage allowance; Grazing; Heifers; Native grassland.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600651