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DESENVOLVIMENTO CORPORAL, IDADE À PUBERDADE E DESENVOLVIMENTO DA GLÂNDULA MAMÁRIA DE FÊMEAS MESTIÇAS LEITEIROS ALEITADAS COM DIFERENTES TEORES DE SÓLIDOS TODAS NA DIETA LÍQUIDA

CAMILA FLAVIA DE ASSIS LAGE.
Tese em Português | VETTESES | ID: vtt-200096
Objetivou-se determinar o efeito do aumento de sólidos totais (TS) na dieta líquida composta por leite integral adicionada de sucedâneo em pó durante o aleitamento sobre o desempenho, idade a puberdade, idade a primeira inseminação, metabolismo de glicose e mammary fat pad de novilhas leiteiras. Novilhas mestiças Holandês x Gir (n = 58) foram distribuídas em quatro diferentes tratamentos durante o aleitamento, os quais consistiram de dietas líquidas com diferentes concentrações de TS 13,5% (n = 15); 16,1% (n =15); 18,2% (n = 13) e 20,4% (n = 15), fornecidas até os 59 dias de idade. Dos 60 aos 89 dias de idade os animais receberam o mesmo concentradoda fase de aleitamento, e silagem de milho foi adicionada a dieta aos 70 dias de idade. Dos 90 aos 104 dias os animais foram adaptados a dieta de pós-aleitamento. Aos 105 dias de idade os animais foram distribuídos em quatro piquetes coletivos, com cochose bebedouros eletrônicos (Intergado® Ltd., Minas Gerais, Brazil) e receberam a mesma dieta total à vontade. Avaliações individuais do consumo de alimentos e de água, do peso corporal e do desenvolvimento corporal foram realizadas até a inseminação artificial (IA) das novilhas aos 350 kg de BW. Avaliações da glândula mamária com uso de ultrassom foram realizadas de 120 dias de idade até a puberdade. Considerou-se que a puberdade ocorreu quando concentrações de progesterona1 ng/mL foram observadas em duas amostras consecutivas. Sendo a primeira dessas avaliações considerada a idade a puberdade. Teste de tolerância à glicose foi realizado aos 280 dias de idade. O aumento da concentração de ST na dieta líquida durante a fase de aleitamento não afetou o consumo de matéria seca, o desempenho, a idade a puberdade, a idade a primeira IA, o metabolismo de glicose, e mammary fat pad da glândula mamária. Porém, aumentou linearmente as medidas de largura de garupa e de perímetro torácico até os 150 e 240 dias de idade, respectivamente.
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Biblioteca responsável: BR68.1
Selo DaSilva