Judul: Analisis kurva pertumbuhan domba priangan dan persilangannya dengan St. Croix dan mouton charollais
Abstrak: Body weight data of Priangan (PP) and crossbreds with St. Croix (HH) and Mouton Charollais sheep (MM) (totally 488 heads, consisted of 149 Priangan Sheep, 115 St. Croix X Priangan (HP), 68 Mouton Charollais X Priangan (MP), 101 MP X HP (MHP) and 55 HM X HP (HMP) heads) were collected at Experimental Station in Indonesian Research Institute for Animal Production. The data were utilized for comparing three non linear growth curve models, i.e Logistic, Gompertz and Von Bertalanffy and the effect of genotype and environment on the goodness of fit, computational simplicity and growth curve parameters. Comparison of genotype, effect interse mating and estimate of heterosis effect were done using Least Square Means methods from growth curve parameter for each models. The results show that the Von Bertalanffy model had better goodness of fit when compared to Gompertz and Logistic models based on the value of Sum Squares Error, Mean Square Error and coefficients of determination, but the model more complicate to compute than the Gompertz and Logistic models regarding on iteration process. Logistic models had smaller standard error for the parameter that have biological interpretation mature size (A) and rate of maturing (k) than others in regard of it’s simplicity in computation. Mature size (A) in all models affected significantly (P<0.01) by genotype, year of birth, sex and type birth and rearing, except in logistic models affected significantly (P<0.05) by type of birth and rearing. Rate of maturing (k) was affected significantly (P<0.01) by year of birth in all models. B/M parameter (integration constant/shape parameter) in all models affected significantly (P<0.01) by year of birth, sex, parity and type of birth and rearing except for the B parameter in Von Bertalanffy model affected significantly (p<0.05) by sex. Crossbreeding increased the mature size (A) compared with Priangan sheep. Relative superiority of mature size (A) of the crossbreds sheep in Logistic, Gompertz and Von Bertalanffy models for MP = 20.6, 19.4 and 19.26 % for HP = 8.6, 8.17 and 8.08 % for MHP = 18.23, 16.92 and 16.94 % for HMP = 20.21, 19.54 and 19.51%, respectively. Crossbreeding decreased rate of maturing (k) of when compared to Priangan sheep. Relative superiority of rate of maturing (k) of the crossbreds sheep in Logistic, Gompertz and Von Bertalanffy models for MP= -7.08, -4.42 and -4.91% for HP =- 1.39, -0.73 and -1.34% for MHP = 6.28, 9.64 and 7.18% for HMP = -1.58, -0.39 and -1.68%, respectively. Mature size (A) tend to decrease in crossbreds sheep because of the interse mating process that make decreased in relative superiority of mature size (A) in the next generation. Rate of maturing (k) fluctuated heavily make it very difficult in biological interpretation because of small sample size that resulted large deviation in predicted heterosis values due to maternal effect and maternal heterosis. Based on this result, it is recommended that Von Bertalanffy model can be used to describe the growth curve model in Priangan sheep and the crossbreds although the model more complicate to compute. It’s indicated that MHP sheep has good prospect to develop further
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Judul: Genetic evaluation of priangan sheep and its crossbred with St. Croix and Moulton Charollais
Abstrak: Domba Priangan (P) memiliki keunggulan jumlah anak sekelahiran tinggi, dapat beranak sepanjang tahun, cepat dewasa kelamin dan resisten terhadap parasit internal. Namun demikian, domba ini memiliki kelemahan produksi susu terbatas, sehingga daya hidup dan laju pertumbuhan anak rendah. Untuk mengatasi masalah tersebut telah dilakukan persilangan dengan domba St. Cmix (menghasilkan domba HP) dan Moulton Charollais (menghasilkan domba MP), kemudian persilangan dilanjutkan untuk membentuk domba komposit tiga bangsa MHP (MP X HM) dan HMP (HP X MP) dengan komposisi gen 50% P : 25% M dan 25% H). Diharapkan hasil persilangan masih memiliki jumlah anak yang tinggi dengan laju pertumbunan anak yang cepat sehingga produktivitas induk meningkat.
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Judul: Penentuan energi aktivasi ion untuk melewati membran teflon pada berbagai larutan elektrolit
Abstrak: Kaseno (1999) menyatakan bahwa dalam teknologi pemisahan, membran adalah bahan yang dapat memisahkan dua komponen dengan cara yang spesifik yaitu menahan atau melewatkan salah satu komponen lebih cepat dari komponen lainnya. Kemampuan pemisahan yang dimiliki oleh membran untuk melewatkan suatu senyawa kimia atau molekul diakibatkan oleh adanya perbedaan sifat fisika atau kimia antara membran dengan senyawa kimia.
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