Consumo e desempenho de novilhas em pastagem recebendo suplementos com diferentes níveis de proteína não-degradável no rúmen

Ribeiro, Marinaldo Divino; Pereira, José Carlos; Vieira, Ricardo Augusto Mendonça; Pacheco, B. M.; Leonel, Fernando de Paula

doi:10.1590/s1516-35982005000700037

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Pesquisas que avaliam o consumo de animais a pasto, geralmente, atribuem grande parte da ingestão de matéria seca as características químicas bromatológicas da forragem (Ribeiro et al, 2005;Ruas et al, 2000). Segundo Van Soest (1994), o consumo pode estar relacionado ao teor da fibra das dietas, com maior proporção do volumoso.…”

Section: Efeitos Dos Ionóforos Sobre O Consumo De Alimentounclassified

Inclusão de aditivos ionóforos na suplementação de bovinos: Revisão

Anjos

2022

Pubvet

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Ionophores can manipulate rumen fermentation and increase feed efficiency, increasing the animal performance. And the com from fermentation arising from some Streptomyces species. Ionophores are classified as substances able to passively interact with ions and cations, acting in this way, as a transport vehicle for them through cellular membranes. Currently, some types of ionophore are known, standing Monensina, Salinomicyn, Lasalocida and Narasina. The objective of this review was to approach the results presented in the literature on the use of ionophores and other additives in the ruminal nutrition, and to clarify their role in ruminal fermentation, consumption, digestion and practical applications in production systems.

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Section: Efeitos Dos Ionóforos Sobre O Consumo De Alimentounclassified

Inclusão de aditivos ionóforos na suplementação de bovinos: Revisão

Anjos

2022

Pubvet

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“…However, studies of the RUP use in dairy heifers' diets are still scarce, and the results are not conclusive. For instance, cattle fed with fish or blood meals showed improved performance and N retention (Bethard et al, 1997;Zanton et al, 2007); in contrast, feeding corn gluten meal had no positive effect on performance (Santos et al, 1998;Ribeiro et al, 2005). To the best of our knowledge, no studies have used rumen-protected soybean meal as an RUP source in heifer diets, although soybean meal has been widely used as feedstuff for cattle and is easy to treat to improve RUP contents.…”

Section: Introductionmentioning

confidence: 99%

Effects of rumen-undegradable protein on intake, performance, and mammary gland development in prepubertal and pubertal dairy heifers

Silva

Detmann

Dijkstra

et al. 2018

Journal of Dairy Science

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The objective of this study was to evaluate the influence of different amounts of rumen-undegradable protein (RUP) on intake, N balance, performance, mammary gland development, carcass traits, and hormonal status of Holstein heifers at different physiological stages (PS). Sixteen prepubertal (PRE) heifers (initial BW = 106 ± 7.6 kg; age = 4.3 ± 0.46 mo) and 16 pubertal (PUB) heifers (initial BW = 224 ± 7.9 kg; age = 12.6 ± 0.45 mo) were used in an experiment over a period of 84 d. Four diets with increasing RUP contents (38, 44, 51, and 57% of dietary crude protein) and heifers at 2 PS (PRE or PUB) were used in a 4 × 2 factorial arrangement of treatments in a completely randomized design. Throughout the experiment, 2 digestibility trials were performed over 5 consecutive days (starting at d 36 and 78) involving feed and ort sampling and spot collections of feces and urine. At d 0 and 83, body ultrasound images were obtained for real-time carcass trait evaluation. The mammary gland was ultrasonically scanned at d 0 and every 3 wk during the experiment. Blood samples were taken at d 0 and 84 to determine serum concentrations of progesterone, estrogen, insulin-like growth factor I (IGF-I), and insulin. No interaction between PS and the level of RUP was found for any trait. Apparent digestibility of dry matter, organic matter, and neutral detergent fiber corrected for ash and protein was not affected by RUP level but was lower for PRE compared with PUB heifers. Sorting against neutral detergent fiber corrected for ash and protein (tendency only) and for crude protein was greater for PUB than PRE heifers. Pubertal heifers had greater average daily gain (905 vs. 505 g/d) and N retention (25.9 vs. 12.5 g/d) than PRE heifers. In addition, average daily gain and N retention were greatest at 51% RUP of dietary protein. Mammary ultrasonography indicated no effects of RUP amounts on mammary gland composition, whereas PRE heifers had greater pixel values than PUB, indicating higher contents of fat rather than protein in the mammary glands of PRE heifers. Serum progesterone and IGF-I concentration was affected only by PS, and PRE heifers had greater values of progesterone and IGF-I concentrations than PUB heifers. Serum insulin concentration was unaffected by PS but tended to be higher at 51% of RUP. In conclusion, an RUP level of 51% increases body weight, average daily gain, feed efficiency, and N retention in heifers regardless of the PS. In addition, PRE heifers have a lower sorting ability and reduced intake, total-tract digestibility, and N retention. They also have higher amounts of fat in their mammary glands, even at moderate growth rates.

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Suplemento múltiplo com ionóforos para novilhos em pasto: consumo, fermentação ruminal e degradabilidade in situ

Mourthé¹,

Reis²,

Ladeira

et al. 2011

Arq. Bras. Med. Vet. Zootec.

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RESUMOAvaliou-se o efeito do suplemento múltiplo com ionóforos sobre o consumo, a fermentação ruminal e a degradabilidade in situ da matéria seca da forragem. Utilizaram-se cinco novilhos Holandês x Zebu fistulados no rúmen, com peso vivo médio de 350kg, em delineamento em quadrado latino. Os tratamentos foram: suplementação múltipla sem ionóforos (CONT); suplementação múltipla com 100mg/cab/dia de monensina (M100); suplementação múltipla com 200mg/cab/dia de monensina (M200); suplementação múltipla com 100mg/cab/dia de lasalocida (L100); e suplementação múltipla com 200mg/cab/dia de lasalocida (L200). O uso de ionóforos no suplemento não influenciou o consumo de forragem, que foi, em média, 7,24kg MS/dia. A presença de ionóforos resultou em ligeiro aumento do pH ruminal em relação à ausência desses aditivos (P<0,05). Houve diferença na concentração do N-NH 3 apenas para os teores de ionóforos em que 200mg/cab/dia reduziu a quantidade de N-NH 3 . As concentrações de acetato, propionato e butirato não foram influenciadas pela inclusão, pelo tipo ou pelos teores de ionóforos. A fração solúvel média (A) da Brachiaria decumbens foi igual a 22%, e a fração insolúvel potencialmente degradável média (B) igual a 65%, resultando em degradação potencial média de 87%. A taxa de degradação média (c) foi de 0,03/hora. Os ionóforos não alteraram a degradação in situ da matéria seca.Palavras-chave: ruminante, lasalocida, monensina, suplementação ABSTRACT

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Consumo e desempenho de novilhas em pastagem recebendo suplementos com diferentes níveis de proteína não-degradável no rúmen

Cited by 4 publications

References 22 publications

Inclusão de aditivos ionóforos na suplementação de bovinos: Revisão

Inclusão de aditivos ionóforos na suplementação de bovinos: Revisão

Effects of rumen-undegradable protein on intake, performance, and mammary gland development in prepubertal and pubertal dairy heifers

Suplemento múltiplo com ionóforos para novilhos em pasto: consumo, fermentação ruminal e degradabilidade in situ

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