Journal article
Effect of clinical mastitis and other diseases on reproductive performance of Holstein cows
Animal reproduction science, Vol.112(3), pp.273-282
2009
Handle:
https://hdl.handle.net/2376/115590
PMID: 18554826
Abstract
The objective of this study was to evaluate the effect of clinical mastitis and (or) other diseases on reproductive performance in lactating Holstein cows. Cows (
n
=
967) from a commercial dairy farm were divided into four groups retrospectively: cows with clinical mastitis and other diseases (MD,
n
=
54), clinical mastitis only (M,
n
=
154), other diseases only (D,
n
=
187), and cows with no record of clinical mastitis or other diseases (H,
n
=
572). Days in milk at first service (DIMFS), services per conception (S/C), days not pregnant (DNP), the rate at which animals became pregnant over time and the proportion of cows that remained non-pregnant during 224 days of lactation were evaluated. Groups MD and M had greater (
P
<
0.05) DNP compared with H (155
±
15 and 140
±
5 vs. 88
±
2, respectively). Moreover, MD and M had greater (
P
<
0.05) S/C compared with H (3.0
±
0.4 and 2.1
±
0.1 vs. 1.6
±
0.1, respectively). The rate at which animals became pregnant over time was less (
P
<
0.05) for MD and M and tended (
P
=
0.1) to be less for D when compared with H. In addition, proportion of cows that remained non-pregnant by 224 days of lactation was greater (
P
<
0.05) in MD, M, and D compared with H. Cows with mastitis were also divided into three groups according to the day of occurrence of the first case of clinical mastitis: (1) clinical mastitis occurred before 56 days postpartum (MP1); (2) clinical mastitis occurred between 56 and 105 days after parturition (MP2); and (3) clinical mastitis occurred after 105 days postpartum (MP3) Regardless of the time of occurrence, DNP was greater (
P
<
0.05) for cows with mastitis compared with H. Time of mastitis occurrence affected S/C in that cows in MP2 and MP3 had a greater S/C compared with H cows (
P
<
0.05). Reproductive efficiency was decreased by the presence of clinical mastitis alone because a greater proportion of cows with mastitis remained non-pregnant over time. Moreover, a greater proportion of cows with mastitis or diseases remained non-pregnant by 224 postpartum. Furthermore, the negative effects on reproduction were exacerbated when cows experienced both clinical mastitis and other diseases.
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Details
- Title
- Effect of clinical mastitis and other diseases on reproductive performance of Holstein cows
- Creators
- A Ahmadzadeh - Animal and Veterinary Science Department, University of Idaho, P.O. Box 442330, Moscow, ID 83844, United StatesF Frago - Animal and Veterinary Science Department, University of Idaho, P.O. Box 442330, Moscow, ID 83844, United StatesB Shafii - Statistical Programs, University of Idaho, P.O. Box 442337, Moscow, ID 83844, United StatesJ.C Dalton - University of Idaho, Caldwell Research and Extension Center, 1904 E. Chicago St., Caldwell, ID 83605, United StatesW.J Price - Statistical Programs, University of Idaho, P.O. Box 442337, Moscow, ID 83844, United StatesM.A McGuire - Animal and Veterinary Science Department, University of Idaho, P.O. Box 442330, Moscow, ID 83844, United States
- Publication Details
- Animal reproduction science, Vol.112(3), pp.273-282
- Academic Unit
- UNKNOWN
- Publisher
- Elsevier B.V
- Identifiers
- 99900547422001842
- Language
- English
- Resource Type
- Journal article