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Effects of two-stage weaning with no...

Lippolis, Katy.

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Effects of two-stage weaning with nose flaps applied to calves on cow performance, calf performance, carcass quality, calf humoral immune response, and fertility.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of two-stage weaning with nose flaps applied to calves on cow performance, calf performance, carcass quality, calf humoral immune response, and fertility./
作者:	Lippolis, Katy.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
面頁冊數:	92 p.
附註:	Source: Masters Abstracts International, Volume: 55-01.
Contained By:	Masters Abstracts International55-01(E).
標題:	Animal sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1597886
ISBN:	9781339016931

Effects of two-stage weaning with nose flaps applied to calves on cow performance, calf performance, carcass quality, calf humoral immune response, and fertility.
Lippolis, Katy.

Effects of two-stage weaning with nose flaps applied to calves on cow performance, calf performance, carcass quality, calf humoral immune response, and fertility. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 92 p.

Source: Masters Abstracts International, Volume: 55-01.

Thesis (M.S.)--Colorado State University, 2015.

Two studies were conducted to evaluate the effects of nose flap devices on cow performance, calf performance both pre- and post-separation from the dam, carcass quality, and calf humoral immune response.

ISBN: 9781339016931Subjects--Topical Terms:

3174829
Animal sciences.

Effects of two-stage weaning with nose flaps applied to calves on cow performance, calf performance, carcass quality, calf humoral immune response, and fertility.
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520 $a Two studies were conducted to evaluate the effects of nose flap devices on cow performance, calf performance both pre- and post-separation from the dam, carcass quality, and calf humoral immune response.
520 $a The objective of the first study was to determine if QuietWean nose flap (NF) devices could be used on calves for a short time, followed by returning calves to normal nursing, to effectively alter dam body condition. This study was conducted at 2 locations using Angus and Angus x Hereford primiparous cows (n = 245). Cow and calf pairs were allocated to 4 treatments in a completely randomized design. Treatments on the calves were: 1) NF for 30 or 31 d while remaining with their dams and removal from dam to the feedlot on d 30 or 31 (LT-30R), 2) NF for 4/5 d while remaining with their dams and removal from dam to the feedlot on 30/31 d (ST- 30R), 3) NF for 4/5 d while remaining with their dams and removal from dam to the feedlot on 60/62 d (ST-60R), and 4) no NF while remaining with their dams and removal from dam to the feedlot on 30/31 d (CON-30R). Cow BCS and BW were collected on d 0, 60 or 62, and 120 or 122. Cow fat thickness (cm) was measured by ultrasound on d 0 and 60 or 62. Calves were weighed on d 0, and 30 or 31, and 60 or 62. By d 60 or 62, BW from cows in CON-30R was less (P < 0.05) than cows in LT-30R or ST-30R. Cows in LT-30R gained more (P < 0.0001) from d 0 to 120 or 122 than all other treatment groups, while cows in ST-60R gained less ( P < 0.05) than all other treatments. Fat thickness as measured by ultrasound did not differ among treatments (P = 0.18). While there was no difference in BCS on d 60 or 62 and 120 or 122, cows in ST-60R decreased (P 0.05) in BCS. There was no difference in cow pregnancy rates of the subsequent year among treatments (P = 0.64). By d 30 or 31, calves in LT-30R gained less (P < 0.0001) than calves from all other treatments. There was no difference (P < 0.05) in BW between calves in ST-30R and ST-60R on d 30 or 31; however, both treatments gained less ( P < 0.0001) than calves in CON- 30R. Calves in CON-30R gained more (P < 0.0001) than calves in the other treatments. Heifer pregnancy rates in CON-30R tended to be lower than all other treatments (P = 0.05). LT-30R heifers were older at calving than ST-30R (P < 0.05). Yearling weight (YWT), HCW, fat thickness, REA, yield grade (YG), and quality grade (QG ) did not differ among treatments. These results indicate that NF weaning devices can improve performance of cows and heifers without negatively impacting steer carcass quality. (Abstract shortened by UMI.).
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