Cana-de-açúcar em substituição à silagem de milho em dietas para vacas em lactação: parâmetros digestivos e ruminais

Magalhães, André Luíz Rodrigues; Campos, José Maurício de Souza; Cabral, Luciano da Silva; Mello, Renius; Freitas, José Antônio de; Torres, Robledo de Almeida; Filho, Sebastião de Campos Valadares; Assis, Anderson Jorge de

doi:10.1590/s1516-35982006000200036

Cited by 32 publications

(34 citation statements)

References 22 publications

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“…Mendonça et al (2004) evaluated pH and ammonia levels in the rumen fluid of dairy cows fed sugarcane and found that pH declined from 7.2 to 6.8 and N-NH 3 levels increased from 3.8 to 16.6 mg/dL from 0 to 3 h postfeeding. The results found in the present study (Figures 1b and 2b) are closer to those obtained by Magalhães et al (2006), who evaluated the rumen fluid of dairy cows fed sugarcane. For periods 0 (before feeding) and 2, 4 and 6 h post-feeding they found pH values of 6.87, 6.71, 6.60 and 6.79 and N-NH 3 levels of 4.66, 20.25, 12.56 and 7.81 mg/dL, respectively.…”

Section: Discussionsupporting

confidence: 90%

“…The dairy cows studied had adequate mean daily feed intake (18.95 kg DM/cow) and feed intake/BW (3.49 kg DM/100 kg BW). Feed intake was close to the 17.26 kg DM cow/day reported in another study of cows with similar milk production potential and receiving a similar roughage:concentrate ratio (Magalhães et al, 2006).…”

Section: Discussionsupporting

confidence: 80%

“…It is unlikely that sugarcane is voluntarily consumed by cattle because of its low crude protein, high lignin content and low digestibility (Magalhães et al, 2006;Mendonça et al, 2004). The dairy cows studied had adequate mean daily feed intake (18.95 kg DM/cow) and feed intake/BW (3.49 kg DM/100 kg BW).…”

Section: Discussionmentioning

confidence: 99%

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Performance and rumen parameters of crossbred dairy cows fed two sugarcane varieties combined or not with soybean hulls

et al. 2014

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-Two sugarcane varieties (IAC86-2480 and IAC91-2195) combined or not with soybean hulls (SH), partially replacing corn in concentrate, were included in the diet of crossbred dairy cows to evaluate the effects on feed intake, milk production, milk composition and rumen parameters of crossbred cows. The sugarcane varieties (IAC86-2480 and IAC91-2195) and concentrate compositions (with and without SH) were analyzed in a 2 × 2 factorial arrangement. Treatments were assigned to blocks by lactation period to evaluate feed intake, milk production and milk composition. A Latin square design was used to analyze rumen parameters. Feed intake, milk production and composition were similar among treatments. Average daily feed intake was 19.93 kg DM in cows fed IAC86-2480 sugarcane and 17.98 kg DM in those fed IAC91-2195, and their average milk production was 19.27 kg and 18.94 kg, respectively. The treatments with IAC86-2480 and IAC91-2195 had different effects on ruminal pH (6.47 and 6.61, respectively) and ammoniacal nitrogen (12.88 and 16.57 mg/dL, respectively). Sugarcane variety and concentrate composition had an interaction effect on volatile fatty acid levels and acetic acid/propionic acid ratio (93.62 mM and 2.54 for IAC86-2480 with SH; 106.70 mM and 2.41 for IAC86-2480 without SH; 115.70 mM and 3.30 for IAC91-2195 with SH; and 93.21 mM and 1.81 for IAC91-2195 without SH, respectively). Sugarcane variety and soybean hull inclusion in feed concentrate do not affect feed intake, milk production or composition in crossbred cows, although these variables change fatty acid production and ruminal pH.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 80%

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Performance and rumen parameters of crossbred dairy cows fed two sugarcane varieties combined or not with soybean hulls

et al. 2014

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“…The animals fed CAS (lower than HCKO), after 24 hours fasting, still had 19.22% of the final body weight in their gastrointestinal tract. This is due to the low rate of passage of this diet, which has low digestibility (Magalhães et al, 2006). Sañudo & Sierra (1986) reported that kill-out is related to production per unit of weight and is variable in sheep (40-60%) because of numerous intrinsic factors (Osório & Osório, 2005) such as genotype, age, sex, type of delivery, degree of fat and weight, as well as extrinsic factors such as number of hours fasting, breeding system, feeding system, stress and cooling conditions.…”

Section: Resultsmentioning

confidence: 99%

Performance and carcass traits of Santa Inês lambs finished with different sources of forage

Menezes

Louvandini²,

Esteves

et al. 2013

R. Bras. Zootec.

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-The objective of this study was to evaluate performance and biometrics of lambs fed different sources of forage. Twenty-four six-month-old Santa Inês female lambs were randomly allocated to four experimental diets and housed in individual stalls. They weighed on average 26.35±0.20 kg. The diets were coast cross hay (HAY), cassava hay (CAS), dehydrated by-product of pea crop (PEA) and saccharin (SAC). The diets were formulated with the same amount of protein and energy with fixed levels of forage (60%) and concentrate (40%). Adaptation to the diet took 7 days, with 45 days on experiment. Weights and biometric measurements were obtained every fortnight and feed intake three times a week. Rights half-carcasses were weighed and sectioned into retail cuts, rib, loin, shoulder, belly, neck and leg, which were weighed individually. Weight gain in lambs was significantly different between diets, with those fed saccharin gaining more. Overall, treatments did not significantly affect biometric measurements. There was a significant difference for feed intake and live weight at the end of the experiment. Animals fed PEA and SAC showed the best results. Average positive correlations were found between biometric measurements and live weight. Treatment PEA had heavier hot (14.36 kg) and cold (14.01 kg) carcass weights than the other groups. Hot carcass kill-out was higher for animals fed PEA as well as ham weight, belly, neck and heart girth. The weight of the abdominal viscera (%) for lambs fed CAS was greater than those fed SAC and PEA. The weights of the thoracic viscera as well as the liver, for lambs fed PEA were higher. The by-product of pea yielded best results, followed by saccharin, and can replace traditional forage sources in the region, providing similar results in terms of cuts and body components. These could be an alternative for feeding sheep in the dry season. The substitution of forages using by-product of pea and saccharin led to improved productivity over the coast-cross hay available in the Federal District -Brazil.

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“…In addition, sugarcane has a high concentration of soluble carbohydrates, an energy source readily available for microbial growth in the rumen. Previous studies have evaluated the substitution of corn silage by sugarcane (MENDONÇA et al, 2004;COSTA et al, 2005;MAGALHÃES et al, 2006;SOUSA et al, the optimum CP content for maximum efficiency of N use without reducing milk yield. Thus, this study aimed to evaluate the effect of using whole raw soybean grain or cottonseed meal associated with two dietary CP content, and their interactions, on the digestive metabolism, lactating performance and efficiency of dietary N utilization in dairy cows fed sugarcane as forage.…”

Section: Introductionmentioning

confidence: 99%

Effect of dietary nitrogen source and crude protein content on nitrogen balance and lactating performance of dairy cows

Migliano

Silano

Martins

et al. 2016

Braz. J. Vet. Res. Anim. Sci.

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The aim of the present study was to evaluate the effect of two crude protein contents (CP) and two main nitrogen sources in the diet of dairy cows, using sugarcane as forage, on intake, total apparent digestibility, milk yield and composition, and nitrogen balance. Twelve Holstein cows in late lactation were assigned in three contemporary square, in a Latin Square design 4 × 4, with 2 × 2 factorial treatment arrangement, in 21-day trial by period, 14 for diet adaptation and the last seven for sampling and analysis. Cows were housed in individual stalls and fed a total mixed ration (TMR) "ad libitum" composed of two main nitrogen sources (cottonseed meal or whole raw soybean grain) and two levels of CP (130g or 148g/kg dry matter -DM) in the diet. In the present study, there was an interaction effect between nitrogen source and crude protein on DM intake (DMI). Cows fed whole raw soybean had higher DMI when the CP content of the diet was 130 g CP/kg DM, while cows fed cottonseed meal had higher DMI when the CP content of the diet was 148 g CP/kg DM. A similar result of DMI was observed for organic matter intake, whereas there was no interaction effect between dietary nitrogen source and crude protein content on intake of other nutrients. Total apparent digestibility of NDF and TDN was higher when soybean was used as the main diet nitrogen source; whereas the digestibility of dietary CP was not changed by the nitrogen sources. Although there were changes in the DMI and the apparent digestibility coefficient, in the current study, there was no effect of dietary crude protein content and nitrogen source on milk yield. In conclusion, the use of low dietetic concentrations of crude protein (130 g/Kg of DM) does not change the lactating performance of dairy cows and may reduce diet cost, while the choice between whole raw soybean grain or cottonseed meal as a protein ingredient may depends only on the availability and/or price, as both ingredients result in similar performance.Keywords: Blood metabolism. Milk yield and composition. Sources of protein. Digestibility. Nitrogen efficiency. ResumoO objetivo do presente estudo foi avaliar o efeito de dois teores proteicos (PB) e duas fontes nitrogenadas na dieta de vacas leiteiras, utilizando cana-de-açúcar como forragem, sobre o consumo, digestibilidade aparente total, produção e composição do leite, e o balanço de nitrogênio. Doze vacas leiteiras Holandesas em estágio intermediário de lactação foram distribuídas em três quadrados contemporâneos, em um delineamento em quadrado latino 4 × 4, com arranjo fatorial de tratamentos 2 × 2, em períodos de 21 dias, onde os primeiros 14 dias foram destinados para a adaptação às dietas e os últimos sete para as coletas de dados e análises. As vacas foram alocadas em baias individuais em um sistema free-stall, e alimentadas com dietas totalmente misturada (TMR) "ad libitum" compostas por duas fontes nitrogenadas principais (farelo de algodão ou grão de soja crú integral) e dois níveis de proteína (130 g ou 148 g/kg de matéria ...

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Cana-de-açúcar em substituição à silagem de milho em dietas para vacas em lactação: parâmetros digestivos e ruminais

Cited by 32 publications

References 22 publications

Performance and rumen parameters of crossbred dairy cows fed two sugarcane varieties combined or not with soybean hulls

Performance and rumen parameters of crossbred dairy cows fed two sugarcane varieties combined or not with soybean hulls

Performance and carcass traits of Santa Inês lambs finished with different sources of forage

Effect of dietary nitrogen source and crude protein content on nitrogen balance and lactating performance of dairy cows

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