Search Result of "Frequencies"

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Waste Output and Loading in Prawn (Macrobrachium rosenbergii De Man) Culture at Different Sizes and Feeding Frequencies)

ผู้เขียน:ImgSontipan Pasugdee, ImgPratuk Tarptipwan, ImgOrapin Jintasathaporn, Imgดร.อุทัยรัตน์ ณ นคร, ศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract

The waste from freshwater giant prawn cultured water were evaluated after feeding with diet of 7.09?0.04 % moisture, 32.60?0.14 % protein, and 4.80?0.13 % fat. The leaching from formulated feed at 0.5, 1, 2, and 3 hours showed soaking period affected on the nutrient leaching and feed stability (p<0.05). Leaching rates were highest in the 0.5 hour (20.97?0.06 g/100 g feed/h), but continued for 3 hours. The highest dry weight lost of 15.92?0.08 % was found at 3 hours. Protein was significant lower but fiber was significantly higher (p<0.05) in longer soaking period feed. The Digestibility and feces leaching of different size prawns (medium size, 100.97 g and large size, 146.56 g) at different feeding frequency (2 and 3 times/day) were also examined. The results showed that prawn sized and feeding frequency were not affected on the daily feed intake. However, the large size prawn had feeding digestibility of 90.61-93.33 % which were higher than medium size prawns (85.05-87.44 % feeding digestibility). The highest nitrogenous waste loaded were found in large size prawn fed 3 times/day.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 040, Issue 5, Jan 06 - Jun 06, Page 269 - 275 |  PDF |  Page 

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ที่มา:วิทยานิพนธ์ ปริญญาโท (จาก: บัณฑิตวิทยาลัย และ สำนักหอสมุด มก.)

หัวเรื่อง:Different Forms of Feed and Feeding Frequencies on Nursing of Sea Bass (Lates calcarifer, Bloch)

ผู้เขียน:

ประธานกรรมการ:Imgประทักษ์ ตาบทิพย์วรรณ

กรรมการวิชาเอก:Imgดร.อรพินท์ จินตสถาพร, รองศาสตราจารย์

กรรมการวิชารอง:Imgดร.สุริยัน ธัญกิจจานุกิจ, ผู้ช่วยศาสตราจารย์

สื่อสิ่งพิมพ์:pdf

Abstract


Dissertation/Thesis Info
Abstract  (cache) |  Full text  (cache)  | Page  (Info)

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Changes of Gene Frequencies in Synthetic Corn Populations by Two Methods of Recurrent Selection and Pedigree Selection)

ผู้เขียน:Imgดร.กฤษฎา สัมพันธารักษ์, ศาสตราจารย์, Imgระพีพงษ์ ยาวิลาศ

สื่อสิ่งพิมพ์:pdf

Abstract

Forty-five F1C0 corn hybrids were derived from diallel series of 10 selected inbreds from different sources of germplasm. AgSyn1C0 was synthesized from bulked balanced seeds of 45 F1C0. The remnant seeds were tested for their yielding ability in randomized complete block design with 4 replications simultaneously, selected plants in border rows were selfed to obtain S1C0. Forty-five S1C0 from diallel set plus 4 additional S1C0 were planted in R-49 grouped replicated honeycomb design. Top-10 F1C0 (diallel selection) and top-10 S1C0 (S1 selection) were selected from each cycle. Their pedigrees were recorded and frequencies of original lines presented in pedigree of selected lines were used to calculate gene frequencies in derived populations. Pedigree selection was also conducted from each selected S1 set from each cycle. Two cycles of selection were done to obtain AgSyn1C1, AgSyn1C2. Two selected lines from pedigree selection were added to AgSyn1C2 to obtain AgSyn1C2-Sem. Changes of gene frequency patterns by the 3 methods of selection were very similar but diallel selection and pedigree selection retained more genetic diversity than S1 selection. Therefore, there was no clear advantage of recurrent selection over the pedigree selection. However, recurrent selection enhances gene recombination and accumulation of desirable genes in the population while pedigree selection is suitable for accumulation of few desirable genes in single plant. The results suggested that recurrent selection should be a supporting program to provide desirable germplasm to pedigree program. Diallel selection not only retained more genetic diversity but needs only 2 planting seasons to complete a cycle instead of 3 planting seasons as most recurrent selections now generally in use. Therefore, diallel selection should be more effective than S1 selection for the improvement of population per se from which good inbreds could be derived. The results also suggested that genetic diversity of first few cycles of selection drastically dropped when combining ability of the original lines were widely different.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 036, Issue 4, Oct 02 - Dec 02, Page 327 - 333 |  PDF |  Page 

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