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EnglishThe aim of this study was to evaluate the economic viability of the use of a lactation induction protocol in Holstein heifers. Were collected data of nutritional, reproductive and sanitary management pre and post-lactation period from 30 induction heifers (IG) and 30 pregnant heifers (CG). All animals were inseminated around 14 months of age and started lactation at 23±4 months. The animals of IG were heifers do not pregnant after two inseminations and natural service e were induced to lactation according to protocol: from the 1st to the 8th day, 30 mg of estradiol benzoate were administered daily, together with 300 mg of progesterone. From the 9th until the 14th, animals only received daily doses of 20 mg estradiol benzoate. On 16th day, 0.56 mg of sodium cloprostenol was administered and injections of 40 mg of dexamethasone sodium phosphate were administered daily from the 19th to the 21st day. On the 1st, 8th, 15th and 22nd day, the animals received a dose of sometribove zinc. The animals of CG were managed according to the farm routine. The costs of the CG during pre and post lactation (nutrition, sanitary, reproduction management) e were higher than the IG, however, when evaluating the economic viability due to lower milk production, the induced group did not leave profit in the first year of use. When comparing the lactation induction with the sale of animals that did not conceive and purchase of animals for replacement, this last scenario showed itself as a better alternative. portuguesO objetivo deste estudo foi avaliar a viabilidade economica do uso de um protocolo de inducao a lactacao em novilhas da raca Holandes. Foram coletados dados economicos do manejo nutricional, reprodutivo e sanitario pre e pos lactacao de 30 novilhas induzidas a lactacao (IG) e 30 novilhas prenhes (CG). Todos os animais foram inseminados em torno de 14 meses de idade e iniciaram a lactacao com aproximadamente 23±4 meses. Os animais do IG foram novilhas que nao conceberam apos duas inseminacoes e monta natural, e foram induzidas a lactacao com o protocolo: do 1° ao 8° dia receberam aplicacao de 30 mg de benzoato de estradiol juntamente com 300 mg de progesterona. A partir do 9° dia ate o 14° receberam 20 mg de benzoato de estradiol. No dia 16 ocorreu uma aplicacao de 0.56 mg cloprostenol sodico e nos dias 19 ao 21, de 40 mg de dexametasona. Nos dias 1, 8, 15, e 22, os animais receberam 500 mg somatotropina recombinante bovina. Os animais do CG foram manejados conforme a rotina da propriedade. Os custos do CG durante o pre e lactacao (nutricao, sanidade, reproducao) foram superiores ao grupo induzido. No entanto, ao avaliar a viabilidade economica, devido a menor producao leiteira, o grupo induzido nao deixou lucro na propriedade no primeiro ano de utilizacao. Ao comparar a inducao de lactacao com a venda de animais que nao conceberam e a compra de animais para reposicao, este ultimo cenario mostrou-se como uma melhor alternativa.

Induction of lactation: an economic study of tool for dairy heifers with successive reproductive failures