Author details:
1 Curso de Zootecnia, Instituto Federal do Triangulo Mineiro, Rua João Batista Ribeiro, 4000, 38064-790, Uberaba, Minas Gerais, Brazil; 2 Faculdade de Medicina Veterinária, Universidade de Rio Verde, Rio Verde, Goiás, Brazil; 3 Departamento de Zootecnia, Universidade do Estado de Mato Grosso, Pontes e Lacerda, Mato Grosso, Brazil; 4 Universidade Estadual Paulista “Júlio de Mesquita Filho”, Jaboticabal, São Paulo, Brazil.
The experiment evaluated the effect of different calcium (Ca) levels in pre-laying and laying diets on the performance and egg quality of laying hens. Two hundred and fifty-six 16-week-old Brown Hisex pullets were housed in a conventional shed. The experiment had a completely randomized design with 4 x 2 factorial arrangement (four calcium levels - 0.8, 1.3, 1.8 and 2.3% in pre-laying phase; two calcium levels - 2.5 and 3.5% in laying phase), totaling eight treatments with four repetitions of eight birds per experimental unit. The experiment started with 16-week-old hens receiving pre-laying diets provided until they were 18 weeks old. At this period, the laying diets started. Four 28-day cycles were evaluated for the following variables: production and egg weight, feed intake, feed conversion, mass of eggs and eggshell quality. Results show that a good performance was obtained with 0.8% calcium level in the pre-laying phase, whereas in the laying phase the 3.5% calcium level provided greater weight egg and better eggshell quality.
Keywords: egg mass, egg production, eggshell quality, feed intake, pullets.
ARAÚJO, J. A.; SILVA, J. H. V.; COSTA, F. G. P.; SOUSA, J. M. B.; GIVISIEZ, P. E. N.; SAKOMURA, N. K. Effect of the levels of calcium and particle size of limestone on laying hens. Revista Brasileira de Zootecnia, v. 40, n. 5, p. 997-1005, 2011.
BERNE, R. B.; LEVY, M. N. Physiology. 2nd ed. St Louis: Mosby Company, 1988.
BERTECHINI, A. G. Nutrição de monogástricos. Lavras: Editora UFLA, 2006.
CASTILLO, C.; CUCA, M.; PRO, A.; GONZÁLEZ, M.; MORALES, E. Biological and economic optimum level of calcium in white Leghorn laying hens. Poultry Science, v. 83, n. 6, p. 868-872, 2004.
CHOWDHURY, S. R.; SMITH, T. K. Dietary interaction of 1.4-diaminobutane (Putrescine) and calcium on eggshell quality and performance in laying hens. Poultry Science, v. 81, n. 1, p. 84-91, 2002.
CLASSEN, H. L.; SCOTT, T. A. Self-Selection of calcium during the rearing and early laying periods of white Leghorn pullets. Poultry Science, v. 61, n. 10, p. 2065-2074, 1981.
CLUNIES, M.; LEESON, S. Effect of dietary calcium level on plasma proteins and calcium flux occurring during a 24h ovulatory cycle. Canadian Journal of Animal Science, v. 57, n. 3, p. 439-444, 1995.
HAMILTON, R. M. G.; CIPERA, J. D. Effects dietary calcium levels during the brooding rearing, and early laying period on feed intake, egg production, and shell quality of Leghorn hens white. Poultry Science, v. 60, n. 2, p. 349-357, 1981.
HARTEL, H. Evaluation of the dietary interaction of calcium and phosphorus in the high producing laying hen. British Poultry Science, v. 31, n. 4, p. 473-494, 1989.
HAWES, R. O.; KLING, L. J. The efficacy of using prelay and early-lay rations for Brown-egg pullets. Poultry Science, v. 72, n. 9, p. 1641-1649, 1993.
HURWITZ, S.; BAR, A. The effect of pre-laying mineral nutrition on the development, performance and mineral metabolism of pullets. Poultry Science, v. 50, n. 4, p. 1044-1055, 1970.
HURWITZ, S.; GRIMINGER, P. Observation on the calcium balance of laying hens. Journal of Agricultural Science, v. 54, n. 3, p. 733-737, 1960.
KESHAVARZ, K.; NAKAJIMA, S. Re-evaluation of calcium and phosphorus requirements of laying hens for optimum performance and eggshell quality. Poultry Science, v. 72, n. 1, p. 144-153, 1993.
LEESON, S.; JULIAN, R. J.; SUMMERS. J. D. Influence of prelay and early-lay dietary calcium concentration on performance and bone integrity of Leghorn pullets. Canadian Journal of Animal Science, v. 66, n. 4, p. 1087-1095, 1986.
LEESON, S.; SUMMERS, J. D. Commercial Poultry Nutrition. 2nd ed. Canada: University Books, 1997.
MAYNARD, L. A.; LOOSLI, J. K.; HINTZ, H. F.; WARNER, R. G. Nutrição Animal. 3. ed. Rio de Janeiro: Freitas Bastos, 1984.
MORENG, R. E.; AVENS, J. S. Ciência e produção de aves. São Paulo: Livraria Roca Ltda., 1990.
MORGAN, C. L.; MITCHEL, J. H. The calcium and phosphorus balance in laying hens. Poultry Science, v. 17, n. 2, p. 99-104, 1938.
MURATA, L. S.; ARIKI, J.; SANTANA, A. P.; JARDIM FILHO, R. M. Níveis de cálcio e granulometria do calcário sobre o desempenho e a qualidade da casca de ovos de poedeiras comerciais. Biotemas, v. 22, n. 1, p. 103-110, 2009.
NRC-National Research Council. Nutrient requirements of poultry. 9th Revised Edition. Washington, D.C.: National Academy of Science, 1994.
ROLAND, D. A. Eggshell quality. III. Calcium and phosphorus requirements of commercial leghorns. World’s Poultry Science Journal, v. 42, n. 2, p. 154-165, 1986a.
ROLAND, D. A. Eggshell quality. IV. Oyster shell versus limestone and the importance of particle size or solubility of calcium source. World’s Poultry Science Journal, v. 42, n. 2, p. 166-171, 1986b.
ROLAND, D. A. Eggshell problems. Estimates of incidence and economic impact. Poultry Science, v. 67, n. 12, p. 1801-1803, 1988.
ROSTAGNO, H. S.; ALBINO, L. F. T.; DONZELE, J. L.; GOMES, P. C.; OLIVEIRA, R. F.; LOPES, D. C. FERREIRA, A. S.; BARRETO, S. L. T.; EUCLIDES, R. F. Tabelas Brasileiras para Aves e Suínos: composição de alimentos e exigências nutricionais. Viçosa: UFV, 2011.
RUTZ, F. Absorção de minerais e vitamina. In: Fundação Apinco de Ciencia e Tecnologias Avícolas. Fisiologia da digestão e absorção das aves. Campinas: Facta, 1994. p. 83-98.
SAEG-Sistema para análise estatística e genética. Manual do Usuário. Viçosa: UFV, 1982.