Artificial Induction of Lactation in Nonbreeder Dairy Cows
Thirty-four cows (26 Holsteins and 8 Jerseys) were subjected to an estrous synchronization protocol administering 2 PGF2Æ Ã injections 11 d apart prior to beginning the lactation-induction protocol. Artificial induction of lactation yielded a 92% success rate for Holstein cows with success defined...
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ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-337212020-09-26T05:36:43Z Artificial Induction of Lactation in Nonbreeder Dairy Cows Jewell, Tracy Michelle Dairy Science Barnes, Michael A. Akers, Robert Michael Pearson, Ronald E. Nickerson, Stephen C. Nebel, Raymond L. estrous cycle dairy cattle induction of lactation Thirty-four cows (26 Holsteins and 8 Jerseys) were subjected to an estrous synchronization protocol administering 2 PGF2Æ Ã injections 11 d apart prior to beginning the lactation-induction protocol. Artificial induction of lactation yielded a 92% success rate for Holstein cows with success defined as achieving >9 kg milk/d, and a 88% success rate for Jersey cows with success defined as achieving > 5 kg milk/d. Mean accumulated milk yield for induced cows at 150 DIM was 65% of mean yield for nontreated cows. Mean peak milk yield for lactation- induced Holsteins and Jerseys was 32 kg/d and 20 kg/d, respectively. Mean serum and milk progesterone concentrations for samples collected during the first 6 d of lactation were not different between lactation-induced and nontreated cows. However, mean serum estradiol concentrations for induced cows were higher (P <0.05) in samples collected 3 and 5 DIM. Lactation-induced cows exhibited an increase in serum alpha-lactalbumin concentrations 2 d prior to initiation of milking, reaching values of ~260 ng/ml. Mean days-to-first service was greatly reduced in cows induced into lactation compared to nontreated cows, while mean services per conception was similar between induced and nontreated cows. Mean days to conception was lower for induced cows than for nontreated cows. By 150 DIM, pregnancy rate of induced cows was 70%, whereas nontreated cows averaged 56% pregnancy rate. Master of Science 2014-03-14T20:40:28Z 2014-03-14T20:40:28Z 2002-08-09 2003-06-24 2004-07-31 2003-07-31 Thesis etd-06242003-071849 http://hdl.handle.net/10919/33721 http://scholar.lib.vt.edu/theses/available/etd-06242003-071849/ final1.pdf In Copyright http://rightsstatements.org/vocab/InC/1.0/ application/pdf Virginia Tech |
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estrous cycle dairy cattle induction of lactation |
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estrous cycle dairy cattle induction of lactation Jewell, Tracy Michelle Artificial Induction of Lactation in Nonbreeder Dairy Cows |
description |
Thirty-four cows (26 Holsteins and 8 Jerseys) were subjected to an estrous synchronization protocol administering 2 PGF2Æ Ã injections 11 d apart prior to beginning the lactation-induction protocol. Artificial induction of lactation yielded a 92% success rate for Holstein cows with success defined as achieving >9 kg milk/d, and a 88% success rate for Jersey cows with success defined as achieving > 5 kg milk/d. Mean accumulated milk yield for induced cows at 150 DIM was 65% of mean yield for nontreated cows. Mean peak milk yield for lactation- induced Holsteins and Jerseys was 32 kg/d and 20 kg/d, respectively. Mean serum and milk progesterone concentrations for samples collected during the first 6 d of lactation were not different between lactation-induced and nontreated cows. However, mean serum estradiol concentrations for induced cows were higher (P <0.05) in samples collected 3 and 5 DIM. Lactation-induced cows exhibited an increase in serum alpha-lactalbumin concentrations 2 d prior to initiation of milking, reaching values of ~260 ng/ml. Mean days-to-first service was greatly reduced in cows induced into lactation compared to nontreated cows, while mean services per conception was similar between induced and nontreated cows. Mean days to conception was lower for induced cows than for nontreated cows. By 150 DIM, pregnancy rate of induced cows was 70%, whereas nontreated cows averaged 56% pregnancy rate. === Master of Science |
author2 |
Dairy Science |
author_facet |
Dairy Science Jewell, Tracy Michelle |
author |
Jewell, Tracy Michelle |
author_sort |
Jewell, Tracy Michelle |
title |
Artificial Induction of Lactation in Nonbreeder Dairy Cows |
title_short |
Artificial Induction of Lactation in Nonbreeder Dairy Cows |
title_full |
Artificial Induction of Lactation in Nonbreeder Dairy Cows |
title_fullStr |
Artificial Induction of Lactation in Nonbreeder Dairy Cows |
title_full_unstemmed |
Artificial Induction of Lactation in Nonbreeder Dairy Cows |
title_sort |
artificial induction of lactation in nonbreeder dairy cows |
publisher |
Virginia Tech |
publishDate |
2014 |
url |
http://hdl.handle.net/10919/33721 http://scholar.lib.vt.edu/theses/available/etd-06242003-071849/ |
work_keys_str_mv |
AT jewelltracymichelle artificialinductionoflactationinnonbreederdairycows |
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1719342340297981952 |