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ABSTRAKStudi tentang pertumbuhan dan distribusi lemak karkas dilakukan pada tiga bangsa sapi pedaging kastrasi yang memasuki fase penggemukan. Penelitian melibatkan 23 ekor sapi brahman, 24 ekor hereford dan 22 ekor persilangan brahmanxhereford dengan kisaran bobot hidup 300-600 kg. Model pertumbuhan alometrik Huxley digunakan untuk mengkaji pola pertumbuhan dan distribusi lemak karkas pada potongan daging wholesale. Secara umum, brahman memiliki koefisien pertumbuhan lemak pada potongan-potongan daging wholasale yang nyata lebih tinggi dari hereford dan atau persilangan brahmanxhereford. Sementara, sapi hereford dan persilangan brahmanxhereford memiliki koefisien pertumbuhan lemak yang relatif sama. Perbandingan pada log natural bobot setengah karkas tanpa lemak 75 kg (4.313 kg), hereford memiliki bobot lemak pada sebagian besar potongan daging wholesale yang nyata lebih tinggi jika dibandingkan dengan brahman dan persilangan brahmanxhereford. Brahman dan hereford menunjukkan distribusi bobot lemak pada potonganpotongan daging wholesale yang relatif sama pada log natural bobot setengah karkas tanpa lemak 114 kg (4.733 kg). Sapi persilangan memiliki bobot lemak pada sebagian besar potongan daging wholesale yang nyata lebih rendah jika dibandingkan dengan hereford dan brahman. ABSTRACTThe growth and distribution patterns of carcass fat were investigated in three breeds of beef cattle entering fattening phase. The study involved 23 grass-fed steer Brahman, 24 Hereford and 22 Brahmanx Hereford crosses with a live weight range from 300-600 kg. An allometric Huxley model was used to study the growth and distribution patterns of fat tissue within wholesale cut. �n most cases, Brahmans �n most cases, Brahmans had significantly higher growth coefficients than Herefords and/or BrahmanxHereford crosses while Herefords and BrahmanxHereford crosses had similar growth coefficients in wholesale cuts. At log natural of 75 kg side muscle+bone weight (4.313 kg), Herefords had significantly a higher fat weight within wholesale cuts than Brahmans and BrahmanxHereford crosses. Comparison at log natural of 114 kg side muscle+bone weight (4.733 kg), whilst Brahmans and Herefords were similar in fat weight distribution, the cross-bred steer had lower fat weights than the other two breed groups in almost all wholesale cuts.

The goal of this experiment was to determine the impact of high and low energy diets on sensory traits of pigs divergently selected for residual feed intake (RFI). Diet had little effect on sensory quality of loins. Line did have an impact on sensory rated juiciness of loins. Loins from animals of the LRFI line had greater juiciness than those of the HRFI line. This difference is most likely not numerically large enough to be detected by the untrained consumer.

The goal of this experiment was to determine the impact of high and low energy diets on adipose tissue quality of animals selected for divergent residual feed intake (RFI). Pigs of a low RFI (efficient) line and high RFI (less efficient) line were placed on either a high energy, low fiber (HELF) diet or a low energy, high fiber (LEHF) diet. Line had no impact on adipose tissue color or iodine value. Regardless of line, feeding a diet low in energy resulted in adipose tissue with a darker colored and increased iodine value, when compared to adipose tissue from animals fed a high energy diet.

and Implications Animals divergently selected for low and high residual feed intake (RFI) were fed either a high energy, low fiber (HELF) or low energy, high fiber (LEHF) diet. Regardless of line, pigs fed the LEHF diet had carcasses with reduced fat depth, loin depth, and greater percent lean. Line had no significant effect on carcass composition traits possibly due to line by sex interactions. Within the low RFI line, barrows had heavier carcasses with greater fat depth, while gilts had carcasses with a greater percent lean. Diet was the largest factor in final carcass composition of pigs in this study.