Reproductive and lean growth performance of gilts reared in all-in/all-out facilities: Effect of vaccination against Mycoplasmal hyopneumoniae and exposure to ammonia.

M.A. Diekman*, A.L. Grant, D.T. Kelly, A.E. Pusateri, J.R. Wagner,
A.B. Scheidt, A.L. Sutton and T.R. Cline

Purdue University, West Lafayette, IN.

Two environmentally regulated rooms with separate but identical ventilation and flush pit manure disposal systems were used to compare reproductive and lean growth measures in gilts reared in all-in/all-out (AI/AO) or continuous (CONT) management systems. Each room contained 9 pens (1.2 x 2.0 m) with a two-hole feeder (15% CP). Three gilts were allotted per pen (.74m2/gilt). One room was operated as a conventional CONT facility (initial wt, 18 kg). To seed the room, gilts of various ages from a conventional grower-finishing unit having a history of Mycoplasma hyopneumonia were placed in the CONT room. The other room was operated as an AI/AO facility. Nine pens of gilts were moved into the room, started on trial, and slaughtered the same day. The AI/AO room was then sanitized and repopulated. Half of the gilts in each room were vaccinated (VAC) at one and 4 wk of age against Mycoplasmal hyopneumoniae. Aerial ammonia concentrations were maintained at approximately 22 ppm in both rooms. When gilts were weighing 105 kg, they were exposed to mature boars for 10 d before slaughter. At 68, 89 and 112 kg BW, fat-free lean (FFLean) was estimated by bioelectrical impedance, ultrasound or TOBEC. Two complete replications have been completed (27 gilts/trt).

 

AI/AO

Continuous

 

Item

VAC

N-VAC

VAC

N-VAC

SEM

P

Slaughter wt, kg

113.9a

114.7a

107.3b

111.6a

.98

.04

Slaughter age, d

183.4

186.2

183.4

186.2

2.6

.77

Adrenal wt, g/kg

.042

.039

.042

.040

.002

.75

Days to 105 kg

168.4

171.5

171.3

174.3

1.9

.36

Lung lesions,%

1.9

2.6

7.4

10.4

2.0

.14

Lesion incidence, %

44.4a

44.4a

100.0b

96.2b

x2=

.001

Cycling, %

29.6

14.8

36.0

11.1

x2=

.10

F/G

3.26

3.48

3.26

3.30

.05

.16

ADG, kg

.74

.71

.66

.66

.02

.07

FFLean, kg at 68 kg BW

22.4

23.0

21.6

22.9

1.76

.94

FFLean, kg at 89 kg BW

28.8

29.6

27.8

29.3

1.25

.76

FFLean, kg at 112 kg BW

35.6a

35.8a

33.9b

35.8a

.22

.02

Lean growth was not affected by AI/AO or vaccination at 68 and 89 kg BW but was decreased in the CONT-VAC treatment group at 112 kg BW. The use of a vaccine (RespiSure) against Mycoplasmal hyopneuomiae did not reduce lung lesions or alter production parameters, but tended to improve reproductive performance.


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