國立虎尾科技大學 |

Effectiveness of Canola Meal as a Source of Rumen-Undegraded Protein for Dairy Cows.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Effectiveness of Canola Meal as a Source of Rumen-Undegraded Protein for Dairy Cows./
作者:	Marostegan de Paula, Eduardo.
面頁冊數:	1 online resource (116 pages)
附註:	Source: Dissertation Abstracts International, Volume: 79-07(E), Section: B.
Contained By:	Dissertation Abstracts International79-07B(E).
標題:	Animal sciences. -
電子資源:	click for full text (PQDT)
ISBN:	9780355632279

Effectiveness of Canola Meal as a Source of Rumen-Undegraded Protein for Dairy Cows.
Marostegan de Paula, Eduardo.

Effectiveness of Canola Meal as a Source of Rumen-Undegraded Protein for Dairy Cows. - 1 online resource (116 pages)

Source: Dissertation Abstracts International, Volume: 79-07(E), Section: B.

Thesis (Ph.D.)--University of Nevada, Reno, 2017.

Includes bibliographical references

Canola is an offspring of rapeseed (Brassica napus and Brassica campestris/rapa), canola seed is rich in oil, and after oil extraction, the remaining "canola meal " (CM), is a rich protein source used as feedstock to different animal species, mainly dairy cows in North America and in Europe. Despite the positive responses in milk production and nitrogen (N) utilization efficiency observed when soybean meal (SBM) is replaced with CM as the main protein supplement in dairy cow diets, it is unclear if the responses are due to a ruminal effect, a post ruminal effect, or a combination of both. The objectives of the research presented here were: 1) to evaluate whether the positive responses in milk production and N utilization efficiency are due to a better ruminal digestibility and N metabolism when CM is compared to SBM in dairy cow diets; 2) to evaluate whether these positive responses may be due to a greater contribution of the rumen undegraded protein (RUP) fraction and/or an increase of microbial protein synthesis to the metabolizable protein supply; and 3) to assess the potentially digestible neutral detergent-fiber (pdNDF) and the energy content of CM in a large sample set. To assess these objectives, first an in vitro study was performed (Chapter 2) evaluating the effects of feeding CM with different RUP content on ruminal fermentation, nutrient digestion, and microbial growth using a dual-flow continuous culture system. For this study, it was observed that CM with RUP varying from 38 up to 50% of CP did not affect ruminal N metabolism. Furthermore, no major differences in ruminal N metabolism and digestibility between SBM and CM diets were observed, which indicate that there are no major ruminal effects of replacing SBM with CM. Then a follow up in vivo study was performed (Chapter 3) to evaluate whether treating CM by extrusion to increase its RUP content would improve RUP flow to the small intestine, N utilization and performance of dairy cows compared to regular CM and SBM. For this study, our results indicate that treating CM by extrusion was not effective in improving CM utilization by lactating in dairy cows. Nonetheless, when compared to the SBM diet, both CM diets decreased milk urea nitrogen (MUN) and N excretion in feces and urine. A third study was performed (Chapter 4) to assess whether the pdNDF of CM is underestimated based on current prediction models, and consequently its energy content is also underestimated. For this study, our results indicate that the pdNDF and the energy content are underestimated in current nutritional models. As an overall conclusion, our results indicate that the positive production responses previously observed when CM replaced SBM may have been due to post-ruminal effects and/or dry matter intake. Furthermore, treating CM by extrusion was not effective in improving CM utilization by lactating in dairy cows. However, CM may reduce the environmental impact compared to SBM, due to a lower urea N excretion as a proportion of total urinary N. More accurate information on CM NDF digestibility may improve energy content estimation, thus improving diet formulation accuracy.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355632279Subjects--Topical Terms:

1178863
Animal sciences.
Index Terms--Genre/Form:

554714
Electronic books.

Effectiveness of Canola Meal as a Source of Rumen-Undegraded Protein for Dairy Cows.
LDR:04412ntm a2200337Ki 4500 001 917406
005 20181012133445.5
006 m o u
007 cr mn||||a|a||
008 190606s2017 xx obm 000 0 eng d
020 $a 9780355632279
035 $a (MiAaPQ)AAI10643014
035 $a (MiAaPQ)unr:12444
035 $a AAI10643014
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Marostegan de Paula, Eduardo. $3 1191445
245 1 0 $a Effectiveness of Canola Meal as a Source of Rumen-Undegraded Protein for Dairy Cows.
264 0 $c 2017
300 $a 1 online resource (116 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 79-07(E), Section: B.
500 $a Adviser: Antonio P. Faciola.
502 $a Thesis (Ph.D.)--University of Nevada, Reno, 2017.
504 $a Includes bibliographical references
520 $a Canola is an offspring of rapeseed (Brassica napus and Brassica campestris/rapa), canola seed is rich in oil, and after oil extraction, the remaining "canola meal " (CM), is a rich protein source used as feedstock to different animal species, mainly dairy cows in North America and in Europe. Despite the positive responses in milk production and nitrogen (N) utilization efficiency observed when soybean meal (SBM) is replaced with CM as the main protein supplement in dairy cow diets, it is unclear if the responses are due to a ruminal effect, a post ruminal effect, or a combination of both. The objectives of the research presented here were: 1) to evaluate whether the positive responses in milk production and N utilization efficiency are due to a better ruminal digestibility and N metabolism when CM is compared to SBM in dairy cow diets; 2) to evaluate whether these positive responses may be due to a greater contribution of the rumen undegraded protein (RUP) fraction and/or an increase of microbial protein synthesis to the metabolizable protein supply; and 3) to assess the potentially digestible neutral detergent-fiber (pdNDF) and the energy content of CM in a large sample set. To assess these objectives, first an in vitro study was performed (Chapter 2) evaluating the effects of feeding CM with different RUP content on ruminal fermentation, nutrient digestion, and microbial growth using a dual-flow continuous culture system. For this study, it was observed that CM with RUP varying from 38 up to 50% of CP did not affect ruminal N metabolism. Furthermore, no major differences in ruminal N metabolism and digestibility between SBM and CM diets were observed, which indicate that there are no major ruminal effects of replacing SBM with CM. Then a follow up in vivo study was performed (Chapter 3) to evaluate whether treating CM by extrusion to increase its RUP content would improve RUP flow to the small intestine, N utilization and performance of dairy cows compared to regular CM and SBM. For this study, our results indicate that treating CM by extrusion was not effective in improving CM utilization by lactating in dairy cows. Nonetheless, when compared to the SBM diet, both CM diets decreased milk urea nitrogen (MUN) and N excretion in feces and urine. A third study was performed (Chapter 4) to assess whether the pdNDF of CM is underestimated based on current prediction models, and consequently its energy content is also underestimated. For this study, our results indicate that the pdNDF and the energy content are underestimated in current nutritional models. As an overall conclusion, our results indicate that the positive production responses previously observed when CM replaced SBM may have been due to post-ruminal effects and/or dry matter intake. Furthermore, treating CM by extrusion was not effective in improving CM utilization by lactating in dairy cows. However, CM may reduce the environmental impact compared to SBM, due to a lower urea N excretion as a proportion of total urinary N. More accurate information on CM NDF digestibility may improve energy content estimation, thus improving diet formulation accuracy.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Animal sciences. $3 1178863
650 4 $a Agriculture. $3 660421
655 7 $a Electronic books. $2 local $3 554714
690 $a 0475
690 $a 0473
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Nevada, Reno. $b Animal Science. $3 1191446
773 0 $t Dissertation Abstracts International $g 79-07B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10643014 $z click for full text (PQDT)