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Induction of lactation in non-pregna...

Chahine, Mireille.

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Induction of lactation in non-pregnant reproductive cull Holstein cows.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Induction of lactation in non-pregnant reproductive cull Holstein cows./
作者:	Chahine, Mireille.
面頁冊數:	71 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6122.
Contained By:	Dissertation Abstracts International65-12B.
標題:	Biology, Animal Physiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3156771
ISBN:	9780496174621

Induction of lactation in non-pregnant reproductive cull Holstein cows.
Chahine, Mireille.

Induction of lactation in non-pregnant reproductive cull Holstein cows. - 71 p.

Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6122.

Thesis (Ph.D.)--University of Minnesota, 2005.

This research was conducted to examine effects of season, estrous stage, somatotropin, and mammary massage on success and subsequent milk production by non-pregnant reproductive cull Holstein cows induced to lactate. The basic treatment used to induce lactation was initiated 14 d prior to initiation of milking and consisted of twice daily injections of 17beta-estradiol (0.1 mg/kg BW/d) and progesterone (0.25 mg/kg BW/d) for 7 d and an injection of dexamethasone (0.05 mg/kg BW/d) 1 d prior to milking. In study 1, cows were induced in February or June and received POSILAC 1 STEP (500 mg bST) on day -13, -3, 6, and 16 of lactation and at 14 d intervals thereafter. Udders were massaged twice daily (2 to 3 min) on d -6 to 0 of lactation. Induction was successful (≥13.6 kg/d in wk 7 of lactation) in 87% of the cows and milk yield (25.0 +/- 1.9 kg/d) and composition were not affected by season. Cows in Study 2 were synchronized to be between 0 to 5 d or 10 to 15 d of their estrous cycle when treatments to induce lactation were initiated. The basic protocol either with or without bST (500 mg on d -13 and -3 of lactation) was used to induce lactation. Cows that were not at the desired stage of estrous also received bST on d -13 and -3 of lactation. All cows received bST on d 6 and 16 of lactation and at 14 d intervals thereafter. Overall success (52%) and milk yield (23.5 +/- 2.9 kg/d) did not differ among treatments but tended to be greater when cows were in late rather than early estrous (58.3 vs. 33.3%). Cows (n = 30) not induced successfully in Study 2 were synchronized to be at 10 to 15 d of their estrous cycle, induced with the basic protocol and bST, and either received or did not receive mammary stimulation on d -6 to 0 of lactation (Study 3). Success (32.0%) was poor but milk yield (17.5 +/- 2.8 kg/d) and composition were similar to that of Study 1 and 2.

ISBN: 9780496174621Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

Induction of lactation in non-pregnant reproductive cull Holstein cows.
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