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S. Sumarsih
Department of Animal Science, Faculty of Animal and Agricultural Sciences, Universitas Diponegoro
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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The effect of stocking density and crude protein level on performance, carcass characteristics, nitrogen use, and ammonia emissions of the Indonesian native chickens F. R. P. Hantoro; D. Sunarti; T. Yudiarti; S. Sumarsih; A. Sinurat
Journal of the Indonesian Tropical Animal Agriculture Vol 49, No 2 (2024): June
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.49.2.157-168

Abstract

This was study aimed to investigate the impact of stocking density and crude protein level on the performance, carcass characteristics, nitrogen (N) use, and ammonia emissions of Sentul Selected (Sensi)-1 Agrinak chickens. A total of 504 chickens were used in the 70-day analysis using a random ized block design with factorial pattern of 3 × 3 which was arranged in nine treatments and four repli cates. The administered treatment covered two factors, including stocking density (A) and crude pro tein level (B). The treatments were administered when chickens reached 5 weeks of age. The results showed that different stocking density significantly influenced (p<0.05) the average weekly feed con sumption per chicken at 6, 7, 8, and 9 weeks, but not at 5, 6, and 10 weeks. However, varying crude protein levels showed no significant effect on carcass weight, giblet weight, and total edible parts. There was also no significant interaction observed between stocking density and crude protein level in relation to carcass weight and edible parts. Furthermore, no significant differences were found in giblet and carcass weights between the two groups (p>0.05). The results showed that feeding Sensi-1 Agrinak chickens with a lower crude protein level of up to 14% did not compromise their performance, meat quality, protein digestibility, or ammonia emissions, but affected carcass characteristics.
Effect of encapsulated M. speciosa fruit extract on growth performance, amino acid digestibility and oxidative status in high density broilers L. Krismiyanto; V. D. Yunianto; S. Sumarsih; S. Sugiharto
Journal of the Indonesian Tropical Animal Agriculture Vol 51, No 2 (2026): June
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jitaa.51.2.149-160

Abstract

This study aimed to evaluate the effects of encapsulation of Medinilla speciosa fruit extract in feed on the oxidative status, amino acid digestibility, and performance of broiler chickens raised at high stocking densities. The M. speciosa contains polyphenols, flavonoids, tannins, and saponins. This study used 290 unsexed Ross strain broiler chicks aged 8 days, with an average body weight of 196.01 ± 1.12 g. M. speciosa fruit extract (MSFE) and encapsulated M. speciosa fruit extract (EMSFE) were used as sources of phytobiotics. This study was designed with four treatments and five replicates. The treatments tested were T0: normal density of 10 birds/m² without MSFE or EMSFE; T1: high density of 16 birds/m² without MSFE or EMSFE; T2: high density of 16 birds/m² + 0.08% MSFE; and T3: high density of 16 birds/m² + 0.08% EMSFE. The results showed that the addition of MSFE and EMSFE to the diet had a significant effect (P<0.05) on performance (feed intake, daily weight gain, and feed conversion ratio), protein and amino acid digestibility, oxidative status (malondialdehyde, superoxide dismutase, and glutathione peroxidase), as well as total lactic acid bacteria, Escherichia coli, and small intestine pH. The conclusion is that incorporating 0.08% encapsulation of M. speciosa fruit extract notably enhances the overall health, absorption of essential amino acids, and growth of broiler chickens raised in high-density conditions, suggesting its promise as an effective phytobiotic feed additive.
Co-Authors A. Sinurat D. Sunarti F. R. P. Hantoro L. Krismiyanto S. Sugiharto T. Yudiarti V. D. Yunianto