-transparent.png){kind=logo}
Recombinant bST at daily dosages of 0, 10.3, 20.6, and 41.2 mg/d were injected for 266 d into 8, 10, 9, and 9 Holstein cows, respectively. Treatment effects of recombinant bST were assessed for milk production traits, BW, blood components, and health and reproductive variables. Data reported compare controls to all bST-treated cows. There was an average increase of 18% in 3.5% FCM for bST versus control cows. This increase resulted in enhanced feed efficiency for bST cows, as their DM intakes were not elevated above those of the control cows. Recovery of BW was similar between control and bST groups. Milk composition was unaffected except for a slight decrease in protein percentage during the first 9 wk of treatment, and an elevated SCC between wk 19 and 28. Blood parameters were not different between control and bST cows, except for hematocrit, which decreased with bST treatment. The only health and reproductive parameters affected by bST were mastitis and days open, which were increased in the highest dosage groups.
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
January 2007,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
March 1991,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
April 1993,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
May 1991,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
October 1989,
Veterinary and human toxicology,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
October 1990,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
November 1990,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
January 1990,
Biology of reproduction,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
April 1993,
Journal of dairy science,
J H Burton, and
G K MacLeod, and
B W McBride, and
J L Burton, and
K Bateman, and
I McMillan, and
R G Eggert
November 1993,
Theriogenology,
