Vle CONG. INTERN. REPROD. ANIM. INSEM. ARTIF., PARIS, 1968, VOL. I|

The effect of methallibure on control of estrus,
fertility and number of piglings.

 

Methallibure Inject. of gonadotropin
only after methallibure

Gt Sow Total Gilt Sow Total

 

No = "o f
Suppress. heads

of estrus b

s 70 149 = = B

 

 

 

() 94,9 97.0 96.0 - = =

First No. of

estfus days to 655 6.0 6.2 D 557 5.6

o Phed estrus

with- Duration

drain Caas) 2.4 2o 2.4 245 2l 2.4
No. of '

C . 5

r::zept Wi 57 L9 106 6 11 17
(%) 86.0 776 825l HIE050) 100.,0 100.0
No. of

I;Il;mb ' dams 36 35 71 b 10 14

piglings Average G166 G e ) 158 1556

 

SUMMARY: Experiments were performed on synchronization of
estrus in pigs by means of oral administration of methalli-
bure with 79 gilts and 70 sows, 149 pigs in total. Dosage
was 100 to 150 mg per head a day, and the treatment lasted

10 to 20 days.

Normal heat and ovulation was suppressed in

94.9 % of gilts and 97.0 % of sows.

Most of pigs come on heat

on the 5th to 7th day following withdrawal of treatment, and
the duration and phenomena of estrus were normal. The con-
ception rate in the first estrus after drawal of treatment
was 87.3 % in gilts, 80.2 % in sows. Duration of pregnancy,
litter size, number of piglings and development of piglings
were normal. In 17 pigs given injection of PMS 1,000 IU on
the next day of withdrawal of oral administration, and HCG
500 MU four days later, the conception rate was 100 %04

and the number of piglings was also considerably larger
than that of methallibure administration only.

1497