Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-01-05T12:08:09Z No. of bitstreams: 2 hudson_bernardes_nunes_oliveira.pdf: 547878 bytes, checksum: 66378b8548d84c2a55ae2734b5c7395b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-01-05T12:08:35Z (GMT) No. of bitstreams: 2 hudson_bernardes_nunes_oliveira.pdf: 547878 bytes, checksum: 66378b8548d84c2a55ae2734b5c7395b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-01-05T12:09:00Z (GMT) No. of bitstreams: 2 hudson_bernardes_nunes_oliveira.pdf: 547878 bytes, checksum: 66378b8548d84c2a55ae2734b5c7395b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2015-01-05T12:09:00Z (GMT). No. of bitstreams: 2 hudson_bernardes_nunes_oliveira.pdf: 547878 bytes, checksum: 66378b8548d84c2a55ae2734b5c7395b (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2013 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Objetivou-se avaliar os efeitos de uma mistura comercial de ?leos essenciais (capsaicina, eugenol, cinamalde?do e carvacrol) microencapsulados, com inclus?es crescentes sobre o consumo, digestibilidade, desempenho e a composi??o do leite de 20 vacas Holandesas prim?paras. O delineamento adotado foi inteiramente casualizado, com parcelas subdivididas no tempo em esquema 4 ? 3 ? 5. A dieta experimental foi formulada para atender ?s exig?ncias dos animais e as doses de ?leos essenciais testadas foram de 0; 1,5; 3,0 e 4,5 gramas por animal ao dia. O experimento teve dura??o de 60 dias e foi divido em tr?s per?odos de 20 dias cada, com as coletas de alimentos, sobras, fezes e leite realizadas nos ?ltimos tr?s dias para posterior an?lise e c?lculos. A an?lise de vari?ncia foi realizada para todas as vari?veis usando modelo linear e, quando os efeitos foram significativos (P<0,05), o teste t-Student foi aplicado para discriminar as m?dias de quadrados m?nimos e quando n?o significativos, foi realizada uma an?lise descritiva. As correla??es existentes entre as medidas tomadas no mesmo animal e a produ??o antes do in?cio do experimento foi usada como covari?vel para verificar se a produ??o pr?via influenciou o resultado. N?o houve intera??o entre os tratamentos e os per?odos avaliados e o efeito dos tratamentos n?o foi significativo (P>0,05) para as vari?veis consumo, digestibilidade, desempenho e composi??o do leite. Mas, avaliando separadamente os per?odos testados, encontrou-se diminui??o significativa (P<0,05) na produ??o de leite e aumento nas concentra??es de s?lidos totais (ST). N?o houve diferen?a (P>0,05) para os teores de extrato seco desengordurado e contagem de c?lulas som?ticas. Concluiu-se que o composto de ?leos essenciais n?o teve intera??o com os per?odos estudados e os n?veis usados n?o influenciaram as vari?veis consumo, digestibilidade, produ??o e composi??o do leite de vacas holandesas prim?paras, indicando a necessidade de maiores estudos sobre o assunto. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Zootecnia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013. / ABSTRACT Aimed to evaluate the effects of a commercial mixture of essential oils (capsaicin, eugenol, cinnamaldehyde and carvacrol) microencapsulated with increasing inclusion on intake, digestibility, performance and milk composition of primiparous Holstein cows 20.The design was completely randomized split plot with a 4 ? 3 ? 5 layout. The experimental diet was formulated to meet the requirements of the animals and the doses of essential oils tested were 0, 1.5, 3.0 and 4.5 grams per animal per day. The experiment lasted 60 days and was divided into three periods of 20 days each, with the collection of food scraps, feces and milk made in the last three days for further analysis and calculations. Analysis of variance was performed for all variables using linear model and when effects were significant (P <0.05), Student's T test was used to discriminate the least square means and when not significant, a descriptive analysis was performed.The correlations between the measures taken in the same animal and production before the start of the experiment was used as a covariate to determine whether the prior production influenced the outcome.There was no interaction between treatment and observation periods and the effect of the treatments was not significant (P> 0.05) for the variable intake, digestibility, performance and milk composition. But, evaluating separately tested periods, showed a significant decrease (P <0.05) on milk production and increased concentrations of total solids (TS).There was no difference (P> 0.05) to the levels of total solids and somatic cell count.It was concluded that the compound of essential oils had no interaction with the periods studied and the levels used did not influence variables intake, digestibility, milk production and composition of primiparous Holstein cows, indicating the need for further studies on the subject.