scholarly journals Decrease in litter weight gain and in progesterone secretion in lactating rats treated with antiserum to rat prolactin

Reproduction ◽  
1976 ◽  
Vol 47 (2) ◽  
pp. 347-349 ◽  
Author(s):  
H. Tomogane ◽  
K. Ota ◽  
A. Yokoyama
Keyword(s):  
Weight Gain ◽  
Litter Weight ◽  
Progesterone Secretion

Genetic relationships between seasonal tissue levels in Scottish Blackface ewes and lamb growth traits

2005 ◽  
Vol 81 (1) ◽  
pp. 11-21 ◽  
Author(s):  
N. R. Lambe ◽  
S. Brotherstone ◽  
M. J. Young ◽  
J. Conington ◽  
G. Simm
Keyword(s):  
Weight Gain ◽  
Birth Weight ◽  
Litter Size ◽  
Growth Traits ◽  
Genetic Relationships ◽  
Genetic Correlations ◽  
Muscle Weight ◽  
Litter Weight ◽  
Weight Gains ◽  
Lamb Growth

AbstractScottish Blackface ewes (no. = 308) were scanned four times per year using X-ray computed tomography (CT scanning) (pre-mating, pre-lambing, mid lactation and weaning), from 18 months to 5 years of age, giving a maximum of 16 scanning events per ewe. Total weights of carcass fat, internal fat and carcass muscle were estimated from the CT images at each scanning event. Lambs produced by these ewes were weighed at birth, mid lactation and weaning to calculate litter growth traits: litter birth weight; litter weight gain from birth until mid lactation; and litter weight gain from birth until weaning. Genetic (rg) and phenotypic (rp) correlations were estimated between ewe CT tissue traits and litter growth traits. Correlations between ewe CT tissue traits and litter size (LS) were also estimated. Ewe CT tissue traits were either unadjusted or adjusted for total soft tissue weight (sum of weights of carcass fat, internal fat and carcass muscle) to investigate relationships with either absolute tissue weights of carcass fat (CFWT), internal fat (IFWT), and carcass muscle (CMWT), or relative proportions of carcass fat (CFP), internal fat (IFP), and carcass muscle (CMP). Litter growth traits were either unadjusted or adjusted for litter size, to investigate relationships with total lamb burden (total litter birth weight (TBW), total litter weight gain from birth until mid lactation (TWGM), total litter weight gain from birth until weaning (TWGW)) or average lamb performance (average lamb birth weight (ABW), average lamb weight gain from birth until mid lactation (AWGM), average lamb weight gain from birth until weaning (AWGW)).Moderate to large positive genetic correlations were estimated between absolute weights of all three ewe tissues (CFWT, IFWT, CMWT), or muscle proportion (CMP), and litter size (LS). Significant positive genetic correlations were also estimated between weight (CMWT) or proportion (CMP) of muscle carried by the ewe pre-mating and total birth weight (TBW) and weight gains (TWGM, TWGW) of her litter, largely due to the associated increase in litter size. Muscle proportion (CMP) was not significantly correlated to average lamb weights or weight gains (ABW, AWGM, AWGW). Pre-lambing carcass fat weight (CFWT) and proportion (CFP) in the ewe showed positive genetic correlations with average lamb weights and weight gains (ABW, AWGM, AWGW), whereas, after lambing, CFP was negatively correlated with these lamb traits. Internal fat weight (IFWT) pre-mating showed positive genetic correlations with all litter growth traits (TBW, TWGM, TWGW, ABW, AWGM, AWGW). Average lamb growth traits were negatively correlated with pre-lambing internal fat proportion (IFP), but positively correlated to IFP at mid lactation and weaning.Correlations were also estimated between each pair of CT traits. Total internal fat weight and total carcass fat weight were very highly correlated (rp= 0·75,rg= 0·96). Correlations with total carcass muscle weight were smaller and positive for both carcass fat weight (rp= 0·48,rg= 0·12) and internal fat weight (rp= 0·42,rg= 0·20).The results suggest that selection for increased carcass muscle weight or proportion in a Scottish Blackface hill flock would have a positive effect on total weights of litters reared, but that selection against carcass fat weight or proportion in a breeding programme for Blackface sheep may have an impact on the maternal ability of the ewe. However, maintaining fat in internal depots may reduce the depletion of carcass fat during pregnancy, allowing this depot to provide energy for lactation, and may have a positive impact on lamb growth.

The effects of level of feeding of sows during pregnancy. II. Changes in body weight

1966 ◽  
Vol 8 (3) ◽  
pp. 499-506 ◽  
Author(s):  
G. A. Lodge ◽  
W. H. Elsley ◽  
R. M. MacPherson
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Significant Decline ◽  
Weight Changes ◽  
Large White ◽  
Litter Weight ◽  
Group A ◽  
C 71 ◽  
Daily Allowance ◽  
Group B

1. Twelve groups of 3 litter-sister Large White gilts were given during three successive pregnancies a daily meal allowance of either 6 lb. (Group A) 3 lb. (Group B) or 3 lb. for 76 days followed by 6 lb. until parturition (Group C). During 8-week lactation periods all received the same daily allowance of 4 lb. meal plus 0·8 lb. for each piglet suckled.2. Net weight gains during the three successive pregnancies respectively were: Group A, 114, 97 and 79 lb.; Group B, 11, 10 and 7 lb.; Group C, 47, 44 and 35 lb. The differences between groups were highly significant (P<0·001) and there was a significant parity interaction (P<0·05) in that Group A sows showed a significant decline in net weight gain from parity to parity whereas those of Groups B and C did not. No relationship was found between net weight gain and litter weight at birth.3. Weight changes during the three successive lactation periods respectively were: Group A, –37, –41 and –36 lb.; Group B, 2, 14 and 4 lb.; Group C, –10, –14 and –5 lb. The differences between groups were significant to various degrees in different lactations. There was no relationship between weight changes during lactation and total litter weight at 3 weeks of age.4. Overall weight changes from first service to third weaning were: Group A, 160 lb.; Group B, 72 lb.; Group C, 71 lb. The differences between Group A and Groups B and C were highly significant (P<0·001).5. The implication of the results as an indication of feed requirements for reproduction is discussed.

A note on the performance, carcass and muscle quality characteristics of pigs sired by Poland China and Large White boars

1973 ◽  
Vol 17 (3) ◽  
pp. 325-328
Author(s):  
J. P. Chadwick ◽  
W. C. Smith
Keyword(s):  
Weight Gain ◽  
Litter Size ◽  
Live Weight ◽  
Quality Characteristics ◽  
Muscle Quality ◽  
Drip Loss ◽  
Large White ◽  
Eye Muscle ◽  
Litter Weight ◽  
Ad Libitum

SUMMARYTwo Poland China boars were mated with 12 Large White females and two Large White boars were used on the same number of females of similar background. In the post-weaning period a trial was conducted to compare the performance of purebred and crossbred progeny given a grower's diet on an ad libitum scale of feeding over the live-weight range 28 to 66 kg. Breed of boar did not influence litter size nor total litter weight at either birth or weaning. Poland China crosses compared with Large Whites grew more slowly to slaughter (10 %) but with equal efficiency of live-weight gain. Cross-breds had higher carcass yields (4 %), shorter (3 %) and deeper (2 %) carcasses, lower depths of mid-line and internal fat (11 %) and larger eye-muscle areas (22%). Breed of boar had little influence on joint proportions and no effect on carcass cut-out value. The eye muscles of crossbred carcasses were paler in colour and had higher transmission values but drip loss from the meat was not different.

Secretion pattern of growth hormone, prolactin, insulin and insulin-like growth factor-1 in the periparturient sow depending on the metabolic state during lactation

1998 ◽  
Vol 67 (2) ◽  
pp. 339-347 ◽  
Author(s):  
W. D. Kraetz ◽  
C. Zimmer ◽  
D. Schneider ◽  
D. Schams
Keyword(s):  
Weight Gain ◽  
Growth Factor ◽  
Energy Balance ◽  
Negative Energy ◽  
Negative Energy Balance ◽  
Blood Collection ◽  
Insulin Like Growth Factor ◽  
Metabolic State ◽  
Nonesterified Fatty Acids ◽  
Litter Weight

AbstractThe aim of the study was to investigate the influence of different energy levels during a 4-week lactation on the regulation of the metabolic hormones somatotropin (GH), prolactin, insulin and insulin-like growth factor-1 (IGF-1). A total of 21 crossbred sows (German Landrace × Duroc) were cannulated for daily blood collection from 3 weeks before parturition until 2 weeks after weaning and for weekly window sampling (every 20 min for 10 h). Nineteen sows were given 2·8 kg food during late gestation, 5·0 kg food during lactation and 2·8 kg food per day after weaning and two sows were given food at a restricted level (3·0 kg) during lactation. In the 19 sows, the different energy balance was induced by allocation of different numbers of sucking piglets to the respective sows. One group of sows suckled seven piglets and served as a control (C; no. = 7) and another group suckled 10 to 12 piglets and was energy deficient (D). After the study, the sows of the deficient group were, based on their litter weight gain from parturition until weaning, divided into low (D-L; no. = 6) or high (D-H; no. = 6) litter weight gain. The D-H sows lost more body weight during lactation than C and had lower glucose and higher nonesterified fatty acids levels before morning feeding. GH and prolactin increased around parturition and their secretory profiles during lactation were altered by the frequent sucking stimulus, whereby the access of the piglets to their dams was not controlled. During lactation, GH and prolactin were highest in D-H sows. The results suggest a possible role of not only GH but also of prolactin in nutrient partitioning to the mammary gland just before the start of lactation and for minimizing the adverse effects of a negative energy balance. Furthermore, insulin and IGF-1 increased around parturition in all sows. Insulin was higher before and after feeding and the highest levels were found in C and D-L sows. The regulation patterns of insulin and IGF-1 indicate that the lactating sow is able to mobilize enough energy from body reserves to prevent metabolic disorders, even during a period with deficient energy supply. This is contrary to the regulation in the dairy cow, where the negative energy balance is coupled with a severe glucose deficit during phases of high milk yield, which causes decreased levels of insulin and IGF-1. In the sow, the glucose intake with the food meets the glucose requirement for metabolic pathways also during a deficient lactational energy intake. Therefore, in sows IGF-1 can be stimulated by increased GH levels via the GH receptor in the liver during a state of nutritional energy deficiency and the fact that sows can compensate a deficient metabolic state much better than cows is also reflected in the respective endocrinology.

PREWEANING WEIGHT AS A MEASURE OF MILK PRODUCTION IN MICE

1971 ◽  
Vol 13 (2) ◽  
pp. 354-361 ◽  
Author(s):  
J. Nagai
Keyword(s):  
Weight Gain ◽  
Milk Production ◽  
Genetic Parameters ◽  
Litter Weight ◽  
Weight Gains ◽  
Cross Fostering

A cross-fostering experiment with random-bred mice was performed to determine the importance of milk production in 12-day weight of a litter containing either six or eight young and in litter weight gains (litter weight gain from birth to 12 days, and litter weight gain from 1-hour nursing at 12 days). Three and four dams that produced young on the same day formed a cross-fostering set in the six-young and eight-young groups, respectively.In the six-young and eight-young groups, milk production accounted for 65 and 66% of the variance, respectively, in 12-day litter weight. Litter weight gain from birth to 12 days and litter weight gain from 1-hour nursing at 12 days had 74 and 61% of their variance accountable to milk production in both young groups. The findings indicate that the importance of milk production (phenotype) in 12-day litter weight and litter weight gains is virtually the same in the two groups. The conclusion was drawn that unless the values of genetic parameters involved are different for litters of six and eight young, the accuracy of estimating the additive genotype of milk production from 12-day litter weight or litter weight gains is similar when a mother suckles six to eight young.

Variation in the absorption of a colostrally secreted marker antibody in piglets

1967 ◽  
Vol 9 (3) ◽  
pp. 385-391 ◽  
Author(s):  
G. C. Perry ◽  
J. H. Watson
Keyword(s):  
Weight Gain ◽  
Serum Antibody ◽  
Late Pregnancy ◽  
High Serum ◽  
Marked Variation ◽  
Litter Weight ◽  
Antibody Titres ◽  
Piglet Serum ◽  
Salmonella Pullorum ◽  
Serum Antibody Titre

1. Sixteen sows were immunised in late pregnancy with Salmonella pullorum antigen. Sows showed marked differences in serum antibody titre at parturition.2. Twelve hours after birth, serum antibody titres in the 173 piglets born to the 16 sows were measured. They were positively related to the serum titres of their mother.3. Marked variation existed in the antibody titres of colostra from different teats and from different sows. No relationship was found between colostral titres and the titres in sow or piglet sera.4. Sow and piglet serum titres were negatively related to piglet and litter weight gain from birth to 7 days of age.5. Those piglets with high serum antibody titres at 12 hr. after birth displayed better growth rates and enjoyed lower mortality than piglets with low antibody titres.

Micelle silymarin supplementation to sows’ diet from day 109 of gestation to entire lactation period enhances reproductive performance, and affects serum hormones and metabolites

2021 ◽  
Author(s):  
Qianqian Zhang ◽  
Je Min Ahn ◽  
In Ho Kim
Keyword(s):  
Weight Gain ◽  
Feed Intake ◽  
Average Daily Gain ◽  
Experimental Unit ◽  
Lactation Period ◽  
Serum Hormones ◽  
Litter Weight ◽  
Total Antioxidant ◽  
Dose Dependent ◽  
Daily Gain

Abstract The aim of the present study was to explore the influences of varying doses of micelle silymarin (0, 0.05%, 0.1%, and 0.2%) supplementation on sows’ feed intake, milk yields, serum hormones, and litter growth using 40 multiparous sows (Landrace × Yorkshire, parity from 3-5) from the109 th prenatal day to the 21 st postnatal day. Each treatment included 10 sows and each sow was used as an experimental unit. On weaning day, litter weight and litter weight gain were linearly improved (P &lt; 0.01, both), corresponding to the increasing dose of silymarin micelle in the diet. Also, litter weight, litter weight gain, and average daily gain (ADG) of piglets born to treated sows exceeded (P &lt; 0.05) those of offspring from the control sows (0% micelle silymarin). Feed intake in week1, week2, and the entire lactation period were increased (linear, P &lt; 0.01) as micelle silymarin dose increased. Body weight (BW) loss of sows during lactation was linearly reduced (P = 0.003) with the increasing amounts of micelle silymarin. Average daily milk yields during lactation were also linearly increased (P = 0.002) in treated sows, exceeding (P = 0.046) that of control sows. Also, uniform increases were observed (P = 0.037) in fat content in milk produced by treated sows on d 14 of lactation. Epinephrine concentrations and aspartate aminotransferase (AST) activity in sow serum on d 21 postpartum were linearly declined (P = 0.010) as micelle silymarin dose increased, and were both declined (P &lt; 0.05) in treated sows compared with the control. In addition, treated sows’ serum had higher activity of superoxide dismutase (SOD) at parturition and glutathione peroxidase (GSH-Px), lower oxidized glutathione (GSSG) concentrations, and GSSG/GSH (glutathione) ratio (all, P &lt; 0.01) on d 21 of lactation. Moreover, offspring from micelle silymarin-treated sows tended to (0.05 &lt; P &lt;0.1) have higher serum catalase (CAT) activity and total antioxidant capacity (T-AOC) concentrations. Taken together, the results showed that sows fed increasing levels of micelle silymarin from the109 th prenatal day to the 21 st postnatal day had an incremental dose-dependent effect on higher feed intake, diminished BW loss, greater milk yields, and greater litter weight at weaning, and 0.2% of micelle silymarin could be optimal to achieve the better effect.

Repeated injections with dexamethasone in healthy lactating sows and the effect on growth rate of their suckling piglets

2001 ◽  
Vol 81 (4) ◽  
pp. 593-596 ◽  
Author(s):  
B. Norby ◽  
B. E. Straw ◽  
P. C. Bartlett ◽  
K. Meyers
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Key Words ◽  
Treatment Period ◽  
Physiological Saline ◽  
Litter Weight ◽  
Lactating Sows ◽  
Suckling Piglets ◽  
Effect On Growth

Twelve lactating sows were given two doses of 14 mg of dexamethasone and 12 controls were given two doses (7.0 mL) of physiological saline. During the treatment period, total litter weight gain in litters of dexamethasone-treated sows was significantly less (P = 0.02) than weight gain of control litters. Key words: Swine, glucocorticoids, growth rate

scholarly journals Effect of suckling intensity of primiparous sows on production performance during current and subsequent parities1

2019 ◽  
Vol 97 (12) ◽  
pp. 4845-4854
Author(s):  
Ji Yao Guo ◽  
Yawang Sun ◽  
Ashley E DeDecker ◽  
Max Terry Coffey ◽  
Sung Woo Kim
Keyword(s):  
Weight Loss ◽  
Body Weight ◽  
Weight Gain ◽  
Litter Size ◽  
Removal Rate ◽  
Body Weight Loss ◽  
Production Performance ◽  
Body Lipid ◽  
Litter Weight ◽  
Lactation Length

Abstract This study was conducted to evaluate the effects of suckling intensity (litter size and lactation length) to primiparious sows on production performance during current and subsequent parities. Upon farrowing, 115 primiparous sows (farrowing weight: 222.7 ± 20.0 kg) were initially allotted to 4 treatments in a 2 × 2 factorial arrangement with 2 litter sizes: 10 and 13 piglets (LS10 vs. LS13), and 2 lactation lengths: 21 and 27 d (LL21 vs. LL27). Upon weaning, sows were rebred and those farrowed successfully (n = 66) kept 10 piglets and weaned at 21 d in the second parity. Sows were fed ad libitum during lactation in both parities. Feed intake, BW loss, backfat loss, litter size, and litter weight gain during lactation in both parities were determined. Litter weight gain in LS13 was greater (P &lt; 0.05) than that in LS10 (54.4 vs. 47.7 kg) during the first lactation. Sows in LS13 had a greater (P &lt; 0.05) BW loss than sows in LS10 (24.1 vs. 17.4 kg). Body weight loss was not different between LL27 and LL21. Sows in LS13 tended to have a greater (P = 0.075) removal rate than those in LS10 (47.5 vs. 32.2%). Sows in LL27 had a smaller (P &lt; 0.05) removal rate than those in LL21 (28.0 vs. 51.7%). In the second parity, gestation BW gain in LL27 tended to be greater (P = 0.098) than that in LL21 when the previous litter size was 10 piglets (56.1 vs. 33.2 kg). Litter performance and feed intake of sows were not affected by previous litter size, lactation length, and their interaction. The farrowing weight, farrowing body protein and lipid, body weight loss was not different between LS13 and LS10, whereas backfat loss in LS13 was smaller (P &lt; 0.05) than that in LS10 during the second lactation (0.9 vs. 2.4 mm). The predicted body lipid loss in LS13 was also smaller than that in LS10 (2.3 vs. 5.3 kg) during the second lactation. Sows in LL27 had a smaller (P &lt; 0.05) BW loss and body lipid loss during the second lactation than sows in LL21 (4.0 vs. 9.0 kg; 2.3 vs. 4.8 kg). The concentration of milk fat in LL27 was smaller (P &lt; 0.05) than that in LL21 (7.9 vs. 9.1%). In conclusion, increasing suckling intensity to primiparous sows increased litter weight gain but increasing litter size reduced piglet ADG. Sow performance in the second lactation was not negatively affected by increasing suckling intensity of the first lactation. Interestingly, sows with an increased suckling intensity in the first lactation had reduced loss of body reserves in the second lactation.

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