Resposta de vacas leiteiras à substituição parcial de farelo de soja por ureia encapsulada

Santos, José Fortunato Ferreira; Júnior, Gilson Sebastião Dias; Bitencourt, Luciene Lignani; Lopes, Naína Magalhães; Júnior, Sancho Siécola; Silva, J.R.M.; Pereira, R.A.N.; Pereira, Marcos Neves

doi:10.1590/s0102-09352011000200021

Cited by 15 publications

(24 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Regarding the digestibility of NDF, the results obtained in the present study are similar to those observed by some authors (Galo et al, 2003;Azevedo et al, 2008;Santos et al, 2011), who did not detect effects of treatments using slowrelease urea on the digestibility of NDF either.…”

Section: Discussionsupporting

confidence: 92%

“…The urea physically encapsulated by vegetable waxes is aimed at reducing the speed of ammonia release into the rumen (Santos et al, 2011). This type of urea has been tested in some experiments with dairy cows (Galo et al, 2003;Akay et al, 2004;Souza et al, 2010;Santos et al, 2011;Sinclair et al, 2012). However, the efficiency of this product must be evaluated in diets for crossbred cows with average milk yield.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Slow-release urea in diets for lactating crossbred cows

et al. 2015

View full text Add to dashboard Cite

-The objective of this study was to evaluate the performance of F1 (Holstein × Zebu) cows in lactation according to different levels of substitution of soybean meal for a protein equivalent non-protein nitrogen originated from slow-release urea (SRU). Eight F1 (Holstein × Zebu) cows in the first third of lactation, with an average milk yield of 12.7 kg (±3.1 kg)/day and a live weight of 552 kg (±30 kg), were used. The experimental design was composed of two simultaneous 4 × 4 Latin squares, with the following treatments: 100% soybean meal and 0% SRU; 66% soybean meal and 34% SRU; 34% soybean meal and 66% SRU; and 0% soybean meal and 100% SRU. Sorghum silage, used as roughage, was supplied together with the concentrate. Feed intake and digestibility as well as milk yield and milk composition were measured. The obtained data were subjected to analysis of variance, adopting a 5% probability level. No intake variable showed significant differences among the treatments, and the mean values for the intakes of dry matter (DM), crude protein (CP) and neutral detergent fiber (NDF) were 18.35 2.62 and 5.85 kg/day, respectively. The results for apparent digestibility also did not show differences among treatments, with DM, CP and NDF averaging 58.16, 58.64 and 36.21%, respectively. Milk yield and composition were similar among the treatments. The average 4%-fat-corrected milk yield was 13.39 kg/animal.day. Intake, digestibility and milk yield and composition variables are not changed according to the substitution of the soy protein for slow-release urea. Thus, for average-milk-yield crossbred animals, this substitution depends on economic variables only.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Slow-release urea in diets for lactating crossbred cows

et al. 2015

View full text Add to dashboard Cite

show abstract

“…In the last few years, products that aim at the control of the release of non-protein nitrogen (NPN) in the rumen have been developed so as to improve the efficiency of transformation of nitrogen into microbial protein (Akay et al, 2004). According to Santos et al (2011), the replacement of feeds that contain true protein by feeds with a higher content of non-protein nitrogen, such as urea, can improve the financial efficiency of feeding and reduce the need to purchase protein contents. Moreover, it allows for the formulation of diets with greater inclusion of energy feeds, fibrous by-products and forages.…”

Section: Introductionmentioning

confidence: 99%

Animal performance and carcass characteristics of Nellore young bulls fed coated or uncoated urea slaughtered at different weights

Pazdiora

Resende

Faria³

et al. 2013

R. Bras. Zootec.

View full text Add to dashboard Cite

-The objective of this study was to evaluate animal performance and carcass characteristics of 64 Nellore young bulls at 22 months of age finished in a feedlot and slaughtered at five body weights (350; 455; 485; 555 and 580 kg) fed diets containing coated or uncoated urea. The experimental design adopted was completely randomized, set in a 4 × 2 factorial arrangement, and for the variables assessed in the control animals, it was 5 × 2. No effect of interaction between slaughter weights and diets were observed, so the variables were analyzed separately, compared by polynomial contrasts and by the F test, respectively. The time animals remained in the feedlot to reach slaughter weights was 66, 88, 145 and 194 days. Average daily gain (ADG) showed quadratic behavior, with a maximum of 1.44 kg/day with animals of 491.7 kg. Dry matter intake (DMI) (kg/day) was similar in all the treatments, but it decreased linearly as body weight increased. The bionutritional efficiency worsened linearly as body weight rose. The elevation in slaughter weight resulted in linear decrease in the percentage of beef round and increase in forequarter. Backfat thickness and rib eye area of the longissimus increased linearly and the percentages of muscle and protein in the carcass reduced and those of fat and ether extract increased linearly as body weight increased. Average daily gain, DMI, feed efficiency and carcass characteristics were not affected by diets containing coated or uncoated urea. However, animals fed coated urea presenter better crude fiber and neutral detergent fiber intake.

show abstract

“…The roughage utilized was sugarcane (Saccharum officinarum) variety RB 72454, treated with 1% of a mixture of urea and ammonium sulfate (9:1) in the experimental phase. Following the recommendations of Santos et al (2011), for a period of seven days before the onset of the experiment, cows received the roughage containing only 0.5% of the mixture of urea aiming to acclimate to this ingredient added to the roughage. The concentrate supplementation level was defined by the isoproteic and isoenergetic balance of the diets according to NRC (2001) to meet the requirements for maintenance, a body weight gain of 0.15 kg/day, and production of 15 kg milk/day (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Fatty acid profile of milk from cows fed palm kernel cake

Pimentel

Silva

et al. 2016

SCA

View full text Add to dashboard Cite

To evaluate the fatty acid profile of milk from cows fed palm kernel cake (PKC), 12 Holstein × Zebu crossbred cows were kept in the feedlot, distributed into a triple 4 × 4 Latin square, and fed the following treatments: 1) control; 2) inclusion of 50 g PKC/kg in the total dry matter (TDM); 3) inclusion of 100 g PKC/kg in the TDM; and 4) inclusion of 150 g PKC/kg in the TDM. Milk samples from the morning and afternoon milkings were collected in the amount of 1% of the daily production of each animal; subsequently, 100-mL subsamples were frozen for analysis of the fatty acid profile. Inclusion of PKC did not change the concentration of short-chain fatty acids or myristoleic (C 14:1 ), pentadecenoic (C 15:1 ), palmitic (C 16:0 ), and palmitoleic (C 16:1 ) fatty acids. Concentrations of medium-chain and lauric (C 12:0 ) and myristic (C 14:0 ) fatty acids increased linearly (P<0.05). A decreasing linear effect was observed (P<0.05) on the concentration of the C 15:0 fatty acid. No effects were observed (P>0.05) on the long-chain fatty acids and those of the omega 6 and 3 series; on the ratio between poly-unsaturated and saturated fatty acids; or on the ratio between the fatty acids of the omega 6/omega 3 series. The concentration of conjugated linoleic acid was not influenced (P>0.05) by inclusion of PKC in the diet. Addition of palm kernel cake to the diet of lactating cows influences the concentration of medium-chain fatty acids, and of lauric (C 12:0 ), myristic (C 14:0 ), and pentadecanoic (C 15:0 ) fatty acids in their milk. Key words: Conjugated linoleic acid. Monounsaturated. Milk production. Polyunsaturated. ResumoPara avaliar o perfil de ácidos graxos do leite de vacas alimentadas com torta de dendê (TD) foram utilizadas 12 vacas mestiças Holandês x Zebu, mantidas em confinamento, distribuídas em um triplo Quadrado Latino 4 x 4 e recebendo os seguintes tratamentos: 1) controle; 2) inclusão de 50 g TD/kg na matéria seca total (MST); 3) inclusão de 100 g TD/kg na MST e 4) inclusão de 150 g TD/kg na MST. Amostras de leite da ordenha da manhã e da tarde foram coletadas na quantidade de 1% da produção diária de cada animal, após subamostras de 100 mL foram congeladas para posterior análise do perfil em ácidos graxos. A inclusão de TD não alterou as concentrações dos ácidos graxos de cadeia curta e dos ácidos graxos Miristoleico C 14:1 , Pentadecenoico C 15:1 , Palmítico C 16:0 e Palmitoleico C 16:1 . Houve efeito linear crescente (P<0,05) para as concentrações dos ácidos graxos de cadeia média, Láurico C 12:0 e Mirístico C 14:0 . Para a concentração do ácido graxo C 15:0 , houve efeito linear decrescente (P<0,05). Não foram observados efeitos (P>0,05) para os ácidos graxos de cadeia longa e da série Ômega 6 e 3, assim como, para a proporção entre os ácidos graxos poli-insaturados/saturados, e entre os ácidos graxos da série ômega 6/ômega 3. A concentração do ácido linoleico conjugado não foi influênciada (P>0,05) pela inclusão de TD na dieta. A inclusão de torta de dendê na dieta de vacas lactantes infl...

show abstract

Resposta de vacas leiteiras à substituição parcial de farelo de soja por ureia encapsulada

Cited by 15 publications

References 23 publications

Slow-release urea in diets for lactating crossbred cows

Slow-release urea in diets for lactating crossbred cows

Animal performance and carcass characteristics of Nellore young bulls fed coated or uncoated urea slaughtered at different weights

Fatty acid profile of milk from cows fed palm kernel cake

Contact Info

Product

Resources

About