STUDIES ON PHYSICAL PROPERTIES OF BUKIT KAMANGS’ LIMESTONE AS MINERAL SOURCE FOR LAYING HENS

Khalil, Khalil and Primasari, Budi and Anwar, Surya (2011) STUDIES ON PHYSICAL PROPERTIES OF BUKIT KAMANGS’ LIMESTONE AS MINERAL SOURCE FOR LAYING HENS. Journal of Indonesian Tropical Animal Agriculture, 36 (3). pp. 171-179. ISSN 2087-8273

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Abstract

Samples of limestone composites were measured for hardness in 5 difference colors: black, dark blue, blue, light blue and white. Limestone was then ground and particle sizes of meal were measured. The meal were mixed with other locally available materials to produce 5 difference mineral formulas: P1: 100% limestone meal, P2: 50% limestone meal + 50% fresh water oyster shell meal, P3: 35% limestone meal + 30% fresh water oyster shell meal + 35% bone meal, P4: 35% limestone meal + 30% fresh water oyster shell meal + 34.2% bone meal + 0.5% salt + 0.3% micro minerals and P5: 100% fresh water oyster shell meal. The formulas were stored for 12 weeks. Samples were taken weekly for analyzing of moisture content and physical properties. By a feeding trial the five mineral formulas were mixed in the level of 6 % into basal diet and fed to 150 laying hens for 24 weeks. Parameters measured included body weight, feed intake, egg production and FCR. Results showed that the composites of Bukit Kamangs’ limestone had difference hardness. The strongest was found by the black composite of 23.4 HRc-C or 245.0 BHN. The meal products contained large particles (>0.42 mm) of 17.8%. Moisture content of mineral formulas increased during storage, but their physical properties were no significant changes. The highest moisture increase was found by the product of 100% limestone, but it could be reduced by mixing with oyster shell meal and bone meal. The best laying performances (P<0.05) were found by the hens fed with diet supplemented with mineral formula containing limestone, fresh water oyster shell and fortified with micro minerals. Keywords: mineral feed, limestone, physical properties, laying nutrition

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