Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Brésil → Vacas leiteiras mestiças a pasto alimentadas com diferentes suplementos no período de transição seca-águas ; Palma forrageira

Universidade Federal Rural de Pernambuco (2008)

Vacas leiteiras mestiças a pasto alimentadas com diferentes suplementos no período de transição seca-águas ; Palma forrageira

Samay de Melo Wellington

Titre : Vacas leiteiras mestiças a pasto alimentadas com diferentes suplementos no período de transição seca-águas ; Palma forrageira

Crossbred dairy cows on pasture fed with different supplements on dry-water transition period

Auteur : Wellington Samay de Melo

Université de soutenance : Universidade Federal Rural de Pernambuco

Grade : Doutor em Zootecnia 2008

Résumé
This study evaluated the intake and apparent digestibility of nutrients ; production and chemical composition of milk ; the additional cost of the supplements ; microbial synthesis of nitrogen and rude protein, and their efficiencies ; plasma levels of glucose and urea ; and excretions of urea in crossbred dairy cows on pasture during the dry-water transition. It was used eight cows (Gyr/Holstein/Brown Swiss) without defined genetic composition, average production of 15 kg/day and average live weight of 500 kg ; distributed in two latin squares. The experimental period lasted 60 days (four sub-periods of 15 days). The following treatments were offered : corn silage + concentrate ; forage cactus + concentrate, corn silage + soybean meal, and forage cactus + soybean meal. The concentrate was elaborated with 27.75% of rude protein. The pasture area used was 53 ha, with Brachiaria decumbens sp.Predomination. The supplements promote addictive effect on pasture nutrients when they contained corn silage andsubstitutive effect when they contained forage cactus. The supplements containing forage cactus promotes smaller intake of neutral detergent fiber and larger of non-fiber carbohydrate. The apparent digestibility of the neutral detergent fiber and non-fiber carbohydrate differ from the use of forage cactus or corn silage. The use of the supplements containing concentrate elevates the milk production up to 17 kg/day in the drought-waters transition period. The supplements can be used without any damage to milk composition. Economical results suggest flexibilization of the supplements. The use of the supplements balances glucose and urea plasmatic levels, as well as the ureaexcretion in urine and milk. There was similarity in the supplements nitrogen metabolism, consequently, nitrogen and of rude protein microbial synthesis they were similar. The efficiency of synthesis of microbial rude protein in cows receiving supplements on grazing in the drought-waters transition period shows an average of 146,20 g MicRP/Kg TDN

Assunto(s) : Palma forrageira, Opuntia fícus indica Mill, Silagem de milho, Brachiaria decumbens, Concentrado, Uréia, Produção microbiana, Vaca leiteira, Concentrate, Corn silage, Efficiency of synthesis, Forage Cactus, Performance, Urea

Présentation

Version intégrale (0,91 Mb)

Page publiée le 23 mars 2011, mise à jour le 10 juillet 2017