Performance and utilization of nutrients in dairy cows fed with sunflower meal

Abstract

Non-decorticated sunflower meal (SFM) is a potential protein source for dairy cows with high-fibre content but high ruminal degradability. The effect of replacement of soybean meal (SBM) and wheat middlings (WM) with SFM on the intake, digestibility, microbial protein synthesis, nitrogen utilization and milk production of dairy cows was evaluated. Twelve Holstein cows were blocked by days in milk and distributed in three 4 × 4 Latin squares. Diets were formulated to be isonitrogenous and contained 550 g maize silage/kg dry matter (DM). Treatment diets were no SFM (CON) or 70, 140 and 210 g/kg DM of SFM replacing fixed mixture of SBM and WM (536 and 464 g/kg of the mixture, respectively). The inclusion of SFM in diet did not affect DM intake, but intake of rumen degradable protein increased linearly. Inclusion of SFM reduced or tended to reduce total-tract digestibility of non-fibre carbohydrate, total digestible nutrients and excretion of purine derivatives. Milk production, milk protein content and efficiency of nitrogen use for lactation were reduced with increasing levels of SFM in the diet. The use of non-decorticated SFM as a replacement for SBM–WM mixture in diet reduces performance and efficiency of nutrient use in lactating dairy cows. The outcome of the current study is attributed to reduced fibre digestibility in SFM hulls. Therefore, future studies should evaluate the use of decorticated SFM.

Ruminal protein degradability of sunflower cake, and effects of feeding sunflower cake on nutrient digestion, nitrogen balance, rumen fermentation, and blood metabolites compared with soybean meal

“…The protein degradability of SFM in the rumen has been reported to be high with values of a, b, and kd ranging from 23% to 39%, from 54% to 71% of CP, and from 6% to 27%/h, respectively (Alexandrov, 1998;Muia et al, 2001;Oliveira et al, 2019;Woods et al, 2003) ruminal degradability of CP in the SFCs used in the present study showed remarkably high values, especially for solubility with more than 70% CP. This high value could be an artifact due to the very fine particles of the feedstuff as passing through the polyester bag, but the DM solubilities were not very high, which suggests that the artifact hypothesis is not likely to be true.…”

Avaliação De Sistemas Energéticos Para Vacas Leiteiras

“…Foi desenvolvido um conjunto de dados para avaliar os sistemas energéticos a partir da análise de 181 observações de 16 dietas experimentais, oriundas quatro ensaios de alimentação de vacas leiteiras (OLIVEIRA et al, 2007;SOUZA et al, 2017;MOURA et al, 2018;e OLIVEIRA et al, 2019). A estatística descritiva do conjunto de dados está apresentada na Tabela 1.…”

“…O consumo de NDT foi obtido por meio de ensaio de digestão in vivo, utilizando a fibra em detergente neutro indigestível como marcador interno de excreção fecal. Oliveira et al (2019) avaliaram em quatro dietas experimentais, o efeito da inclusão de farelo de girassol (0,7,14 e 21% base de matéria seca) em dietas contendo 55% de silagem de milho e 45% de concentrado (base da matéria seca). Foram utilizadas 12 vacas da raça Holandesa no terço médio de lactação (média por tratamento entre 27 a 30 kg de leite/dia) em delineamento quadrado latino, em quatro períodos 21 dias cada, sendo 14 dias de adaptação e sete dias para coleta de dados sobre a produção e composição do leite, peso corporal, variação de peso corporal e consumo de NDT.…”

“…Observações oriundas quatro experimentos(OLIVEIRA et al, 2007; SOUZA et al, 2017;MOURA et al, 2018;OLIVEIRA et al, 2019). Todas as vacas com estavam com menos de 190 dias de gestação.…”

Impact of Extruded Feed Supplements on The Productivity of Lactation Cows

“…It is possible to increase the nutritional value and reduce the deficiency of the protein [11], mineral components and easily digestible carbohydrates (sugars) in feed supplements using by-products of food processing plants (oil cake and oil meal of vegetable raw materials, beet molasses, etc.) [12,13].…”