Group Title: Department of Animal Science mimeograph series - Florida Agricultural Experiment Station ; no. 63-4
Title: Sow productivity as affected by single vs. double matings
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Permanent Link: http://ufdc.ufl.edu/UF00072932/00001
 Material Information
Title: Sow productivity as affected by single vs. double matings
Series Title: Department of Animal Science mimeograph series
Physical Description: 4 p. : ; 28 cm.
Language: English
Creator: Wallace, H. D ( Harold Dean )
Combs, G. E ( George Ernest ), 1927-
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville Fla
Publication Date: 1962
 Subjects
Subject: Swine -- Breeding -- Florida   ( lcsh )
Sows -- Productivity -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references (p. 3).
Statement of Responsibility: H.D. Wallace and G.E. Combs.
General Note: Caption title.
General Note: "July, 1962."
 Record Information
Bibliographic ID: UF00072932
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 77224314

Full Text




Department of Animal Science Florida Agricultural
Mimeograph Series No. 63-4 Experiment Station
July, 1962 Gainesville, Florida

SOW PRODUCTIVITY AS AFFECTED
BY SINGLE VS. DOUBLE MATINGS

H. D. Wallace and G. E. Combs 1/


The average length of estrous in the sow is 2-3 days with a range of
from 1-5 days. Ovulation usually occurs during the second day of estrous,
but there is no practical method of predicting exactly when a sow will
ovulate. The breeder's problem is to ensure that large numbers of vigorous
fresh sperm will be present in the -allopian tubes at the time of ovulation.
The ova do not retain vitality for mNe than a few hours after ovulation.
Fortunately, survival of the sperm is relatively long compared to the ova.
Multiple services during estrous should tend to provide conception insur-
ance and also have a favorable influence on litter size. A few previous
studies have demonstrated that this is so. For example, the Missouri
Station (1) reported that a single service settled only 61 percent of the
sows and produced an average of 7.9 pigs per litter, whereas two services
settled 84 percent of the sows and produced litters that averaged 8.9 pigs.

The study herein reported was undertaken to further explore this pro-
blem, particularly as it relates to multiple farrowing.

Experimental

A description of the sow herd and the feeding and management proce-
dures used in this study were presented in a previous report (2).

During each breeding period (21 days) an attempt was made to mate
approximately half of the sows once and half twice. Selection for single
or double matings was strictly on a random basis. Each sow was bred on
the first day observed in heat and then 24 hours later if a second mating
was involved. The purebred Durocs were mated to the same boar on second
service. In the case of the crossbred sows, which was the predominant
group in the study, the second mating was to a second boar. Two, litter-
mate Hampshire boars were used for this purpose.

Results and Discussion /PE '

Data on conception rate, as influenced by one v eus two matin s is
presented in Table 1, With one exception (June, 1961), concept. at2
was superior in each of the mating seasons for those so h3 :
double mated. A total of 93 sows were single mated and .6 percent n-
ceived. One hundred and six sows were double mated and 89.6 pierce I
conceived. The beneficial effect of double matings on conceptigjs ems
apparent, L IR



I/ Wallace and Combs, Animal Nutritionist and Associate Animal Nutri-
tionist, Animal Science Department. The assistance of W. E. Collins
and L. S. Taylor, Swine Herdsmen, is gratefully acknowledged.










Table 1. Conception Rate as Affected by Number of Matings


Breeding Single Double
Season Matings Matings
Number Number Percent Number Number Percent
Matings Returnees Conception Matings Returnees Conception


November, 1960 19 3 84.2 12 0 100.0

February, 1961 6 0 100.0 14 1 92.9

April, 1961 9 1 88.9 16 1 93.8

June, 1961 6 1 83.3 10 3 70.0

August, 1961 11 5 54.5 14. 5 64.3

October, 1961 15 5 67.0 12 1 91.7

December, 1961 10 1 90.0 17 0 100.0

February, 1962 17 3 82.3 11 0 100.0


TOTALS 93 19 79.6 106 11 89.6








-3-


A summary of sow productivity for each of the farrowings as influenced
by one versus two matings is presented in Table 2. In seven of the eight
farrowing seasons, sows double mated outperformed those that were single
mated, both in terms of live pigs farrowed per litter and number of pigs
weaned per litter. In June of 1961 the live pigs farrowed per litter was
approximately the same for the two groups. The 73 litters from sows mated
once averaged 9.26 live pigs at birth, whereas the 94. litters from sows
mated twice averaged 10.68 live pigs at birth. The number of pigs weaned
per litter were 8.31 and 9.37 respectively. Thus the double matings
yielded approximately one extra pig per litter at weaning. Differences in
survivability and average weaning weights were very small in magnitude.

Summary

A study has been conducted to determine the influence of one versus
two matings during the heat period, on conception rate and sow producti-
vity.

A single service (93 sows) settled only 79.6 percent and produced an
average of 9.26 live pigs per litter from which 8.31 pigs were weaned.
Double services (106 sows) settled 89.6 percent and produced an average
of 10.68 live pigs per litter from which 9.37 pigs were weaned. The eco-
nomic feasibility of double mating, even though the procedure may necessi-
tate an extra boar, is clearly evident from this study.

References

1. Missouri Agricultural Experiment Station Mimeo. 16th Annual Feeder's
Day. 1954.

2. Florida Agricultural Experiment Station Animal Science Mimeo Series
63-2, 1962.









Table 2. LITTER SIZE AND SOW PRODUCTIVITY AS AFFECTED BY SINGLE VS. DOUBLE RATINGS


Breeding Farrowing Number Number Number Percent Average Weaning
Date Date Litter Live Pips Pigs Weaned Survival Weight
Per Litter Per Litter (2 weeks)


(Single Matings)
Nov., 1960 March, 1961 16 8.69 8.25 94.9 8.29
Feb. 1961 June, 1961 6 9.33 7.50 80.4 7.47
Apr., 1961 Aug., 1961 8 7.00 5.50 78.6 8.09
June, 1961 Oct., 1961 5 10.00 8.40 84.0 6.75
Aug., 1961 Dec., 1961 6 9.67 9.33 96.5 7.62
Oct., 1961 Feb., 1962 10 10.50 9.70 92.4 8.13
Dec., 3961 Apr., 1962 8 10.13 8.80 8E6.9 7.53
Feb., 1962 June, 1962 14 9.36 8.57 91.6 7.08
( 9,26)/ ( 8.31)/ ( 89.5)1/ ( 7.70)1/


(Double Matings)
Nov., 1960 March, 1961 12 10.30 9.92 96.2 8.25
Feb., 1961 June, 1961 13 9.31 8.38 90.0 7.64
Apr., 1961 Aug., 1961 15 10.53 8.80 83.6 7.28
June, 1961 Oct., 1961 7 10.43 8.43 80.8 C,93
Aug., 1961 Dec., 1961 9 11.55 10.00 86.6 7.97
Oct., 1961 Feb., 1961 11 11.45 10.10 88.2 8.19
Dec., 1961 Apr., 1962 16 10.75 9.19 85.5 7.66
Feb., 1962 June, 1962 11 11.55 10.36 89.7 7.26
(10.68)2/ ( 9.37)2/ ( 87,7)2/ ( 7.66)2/


1/ Average for single matings. 2/


Average for double nctings.




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