Embryo losses in sheep during short-term nutritional supplementation

2012 ◽  
Vol 24 (8) ◽  
pp. 1040 ◽  
Author(s):  
C. Viñoles ◽  
K. M. M. Glover ◽  
B. L. Paganoni ◽  
J. T. B. Milton ◽  
G. B. Martin
Keyword(s):  
Nutritional Supplement ◽  
Nutritional Supplementation ◽  
Short Term ◽  
Embryo Survival ◽  
Embryo Mortality ◽  
Treatment Groups ◽  
Metabolic Hormones ◽  
Igf I ◽  
And Control

To test whether a nutritional supplement fed from 6 days before until 15 days after insemination reduces progesterone concentrations and increases embryo losses, Merino ewes were artificially inseminated (Day 0). Control ewes (n = 116) were not supplemented whereas Lupin6 ewes (n = 112) were supplemented with 500 g lupin grain daily for 6 days before insemination, and Lupin6+15 ewes (n = 122) from 6 days before until 15 days after insemination. There were no major differences between treatment groups in progesterone concentrations over the first 17 days of pregnancy. Embryo losses over Days 10–17 were lower in the Lupin6+15 than in the Control and Lupin6 groups, but the opposite occurred from Day 17–30. The concentrations of insulin and IGF-I were higher in Lupin6+15 ewes on Days 5, 12 and 17, compared with Lupin6 and Control ewes, while leptin concentrations decreased by Day 17 in the Lupin6+15 group. We conclude that feeding ewes for 15 days after mating improved embryo survival, which was associated with an increase in the concentrations of metabolic hormones and lower progesterone concentrations. However, the decrease in leptin concentrations promoted by the interruption of supplementation seems be linked to increased embryo mortality up to Day 30.

scholarly journals Short-term nutritional supplementation of ewes in low body condition affects follicle development due to an increase in glucose and metabolic hormones

Reproduction ◽  
2005 ◽  
Vol 129 (3) ◽  
pp. 299-309 ◽  
Author(s):  
C Viñoles ◽  
M Forsberg ◽  
G B Martin ◽  
C Cajarville ◽  
J Repetto ◽  
...  
Keyword(s):  
Body Condition ◽  
Oestrous Cycle ◽  
Nutritional Supplementation ◽  
Ovulation Rate ◽  
Follicle Development ◽  
Short Term ◽  
Metabolic Hormones ◽  
The Third ◽  
Short Period ◽  
Igf I

This study tested whether the effects of a short period of nutritional supplementation given to ewes during the luteal phase on follicle development and ovulation rate is associated with an increase in circulating concentrations of FSH, glucose or metabolic hormones. Oestrus was synchronised with two prostaglandin injections given 9 days apart and the supplement consisted of corn grain and soybean meal. Corriedale ewes with low body condition were randomly assigned to 2 groups: the control group (C; n = 10) received a maintenance diet while the short-term supplemented group (STS; n = 10) received double the maintenance diet over days 9 to 14 of the oestrous cycle (day 0 = ovulation). Ovaries were examined daily by ultrasound and blood was sampled three times a day during the inter-ovulatory interval for measuring reproductive and metabolic hormones. On days 9, 11 and 14 of the oestrous cycle, half of the ewes from each group (n = 5) were bled intensively to determine the concentrations of glucose, insulin, IGF-I and leptin. Plasma FSH, progesterone, oestradiol and androstenedione concentrations were similar among groups. Dietary supplementation increased plasma insulin concentrations from the first to the sixth day of supplementation and increased glucose concentrations on the third day, compared with control ewes. Plasma leptin concentrations were higher in STS ewes from the second to the fifth day of supplementation. The pattern of IGF-I concentrations was similar among groups. In STS ewes, the nutritional treatment prolonged the lifespan of the last non-ovulatory follicle, so fewer follicular waves developed during the cycle. In STS ewes, increased concentrations of glucose, insulin and leptin one day before ovulatory wave emergence were associated with increased numbers of follicles growing from 2 to 3 mm and with stimulation of the dominant follicle to grow for a longer period. We suggest that the mechanism by which short-term nutritional supplementation affects follicle development does not involve an increase in FSH concentrations, but may involve responses to increased concentrations of glucose, insulin and leptin, acting directly at the ovarian level. This effect is acute, since concentrations of all three substances decrease after reaching peak values on the third day of supplementation. The status of follicle development at the time of maximum concentrations of glucose and metabolic hormones may be one of the factors that determines whether ovulation rate increases or not.

scholarly journals Birth of lambs of a pre-determined sex after in vitro production of embryos using frozen–thawed sex-sorted and re-frozen–thawed ram spermatozoa

Reproduction ◽  
2004 ◽  
Vol 127 (5) ◽  
pp. 557-568 ◽  
Author(s):  
F K Hollinshead ◽  
G Evans ◽  
K M Evans ◽  
S L Catt ◽  
W M C Maxwell ◽  
...  
Keyword(s):  
High Speed ◽  
Gradient Centrifugation ◽  
In Vitro Production ◽  
Blastocyst Development ◽  
Embryo Survival ◽  
Treatment Groups ◽  
Sperm Migration ◽  
And Control

The characteristics and functional capacity of ram spermatozoa frozen–thawed prior to and after flow cytometric sorting was assessed after incubation (37 °C; 6 h),in vitrofertilisation (IVF), and transfer of fresh and vitrifiedin vitroproduced embryos. Frozen-thawed spermatozoa from two rams were allocated to four treatment groups: (i) non-sorted (Control); (ii) sorted (FS); (iii) sorted then re-frozen (FSF) and (iv) re-frozen control (FCF). Frozen-thawed samples were separated into X- and Y-chromosome bearing spermatozoa using a high-speed sperm sorter after density gradient centrifugation (X: 88 ± 1.5% and Y: 87 ± 1.1% purity). After 6 h incubation (37 °C), the percentage of motile spermatozoa was higher (P< 0.001) for FS (84 ± 2.0%) compared with all other treatments (Control: 36 ± 3.3%, FSF: 28 ± 3.1%, FCF: 20 ± 2.0%). In a sperm migration test greater numbers of FS spermatozoa penetrated 5 mm into the artificial cervical mucus compared with spermatozoa from all other treatments (152 ± 39.4 vs 31 ± 9.2 spermatozoa respectively;P< 0.05). Fertilisation and cleavage rates were higher (P< 0.05) forin vitromatured oocytes inseminated with Control compared with FSF spermatozoa. However, the Day 7 blastocyst development rate was higher for oocytes inseminated with FSF (62.2%) than FS and Control spermatozoa (52.7 and 50.0%;P< 0.05). The number of ewes pregnant (Day 60), lambing and thein vivoembryo survival rate was greater (P< 0.01) after the transfer of fresh embryos rather than vitrified embryos derived from X- and Y-spermatozoa (67.6, 64.7 and 41.2% vs 29.6, 25.9 and 14.8% respectively). Twenty-six of the 30 (86.7%) lambs derived from sex-sorted spermatozoa were of the correct sex. These results demonstrate that frozen–thawed ram spermatozoa can be sex-sorted for immediate or future use after re-cryopreservation and, in conjunction with IVF and embryo transfer, can be used to efficiently produce offspring of pre-determined sex.

The effect of pre- and post-insemination plane of nutrition on embryo survival in beef heifers

1999 ◽  
Vol 69 (2) ◽  
pp. 411-417 ◽  
Author(s):  
L.D. Dunne ◽  
M.G. Diskin ◽  
M.P. Boland ◽  
K.J. O’Farrell ◽  
J.M. Sreenan
Keyword(s):  
Energy Intake ◽  
Detrimental Effect ◽  
Early Embryo ◽  
Short Term ◽  
Embryo Survival ◽  
Plasma Progesterone ◽  
Treatment Groups ◽  
Embryo Recovery ◽  
Maintenance Requirements

AbstractEarly embryo loss is the major cause of reproductive failure in cattle. The effect of short-term changes in energy intake pre- and post-insemination on embryo survival and systemic progesterone was investigated in heifers. Two pasture allowances (low, L and high, H) were calculated on a dry-matter basis to provide 0⋅8 and 2⋅0 times maintenance requirements, respectively. Following oestrous synchronization, heifers (no. = 296) were allocated to either L or H pasture allowance for a 10 day period before artificial insemination (AI). On the day after AI, heifers (no. = 247) were again randomly allocated to either the L or H pasture allowance until either embryo recovery between days 14 to 16 or pregnancy diagnosis at day 30 (AI = day 0). Hence, there were four nutrition treatments; L-L, L-H, H-H and H-L. Blood samples were collected on days 4, 5, 6 and 7 of the pre- and days 4, 5, 6, 7, 13 and 14 of the post-AI oestrous cycle (oestrus = day 0) for determination of plasma progesterone. Embryo survival rate was significantly lower in the H-L (0⋅38) than in the L-L (0⋅70), L-H (0⋅71; P < 0⋅001) or H-H (0⋅65; P < 0⋅01) treatment groups but there was no evidence that the detrimental effect of reduced energy intake after AI was mediated through changes in systemic progesterone.

Artificial long days increase milk production in subtropical lactating goats managed under extensive grazing conditions

2014 ◽  
Vol 153 (2) ◽  
pp. 335-342 ◽  
Author(s):  
M. J. FLORES ◽  
J. A. DELGADILLO ◽  
J. A. FLORES ◽  
F. J. PASTOR ◽  
G. DUARTE ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Nutritional Supplement ◽  
Nutritional Supplementation ◽  
Long Day ◽  
Extensive Grazing ◽  
Lactating Goats ◽  
Igf I ◽  
Natural Photoperiod ◽  
The Difference

SUMMARYThe objective of the current study was to determine whether exposure to an artificial long-day photoperiod increases milk production in subtropical goats maintained under extensive grazing conditions, with or without the presence of a nutritional supplement. Forty-four lactating goats were exposed to a natural photoperiod (11 h light) with nutritional supplementation (NDS; natural day supplemented group; n=11) or without nutritional supplementation (NDN; natural day non-supplemented group; n=11) or to an artificial long-day photoperiod (16 h light) with nutritional supplementation (LDS; long-day supplemented group; n=11) or without nutritional supplementation (LDN; long-day non-supplemented group; n=11). Daily nutritional supplementation consisted of a mixture of 300 g rolled maize and 200 g soya bean per animal. During the suckling phase, milk yield was assessed at 10 and 20 days lactation and thereafter every 10 days up to 110 days lactation from day 40 of lactation. Plasma insulin-like growth factor 1 (IGF-I) concentration was determined at 20, 40, 60, 80 and 100 days of lactation. Mean milk yield was greater in goats from the LDN group than the NDN group. The difference in mean milk yield was greater when goats received a nutritional supplement. With nutritional supplementation, the plasma IGF-I concentrations were greater in goats exposed to long days than in those maintained under natural photoperiod. However, IGF-I concentrations were lower with long days when goats were not supplemented. In conclusion, exposure to an artificial long-day photoperiod increases milk yield in subtropical lactating goats maintained under extensive grazing conditions, and this increased milk production is more pronounced with a nutritional supplement. Furthermore, depending on nutritional status, exposure to artificial long days increases plasma IGF-I concentration in lactating goats.

Methemoglobin Levels in Channel Catfish, Ictalurus punctatus, Exposed to Nitrite and Tricaine Methanesulfonate

1982 ◽  
Vol 39 (4) ◽  
pp. 643-645 ◽  
Author(s):  
D. W. Huey ◽  
T. L. Beitinger
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Short Term ◽  
Treatment Groups ◽  
Total Hemoglobin ◽  
Short Term Exposure ◽  
And Control ◽  
Tricaine Methanesulfonate

Channel catfish (Ictalurus punctatus) were exposed for 24 h to one of the following: 4.0 mg/L nitrite, 4.0 mg/L nitrite + 40 mg/L TMS-222, 40 mg/L TMS-222 and control in which neither chemical was added. Methemoglobin concentrations reported as percentage of total hemoglobin equalled mean ± SD (n) 65.9 ± 10.8 (10), 45.7 ± 9.1 (15), 13.7 ± 5.9 (26), and 2.2 ± 0.4 (10) in the four groups, respectively. Mean methemoglobin in each o f the three treatment groups was significantly greater than controls and significantly different among each other. As expected, nitrite-induced methemoglobinemia was slightly reduced in the presence of TMS-222 for this short-term exposure. The most important finding was that catfish exposed to TMS-222 had methemoglobin levels 6 times greater than those of controls.

Efficacy of Ovsynch and Ovsynch Plus Protocol for Improvement of Fertility in Postpartum Sahiwal Cows

2019 ◽  
Vol 14 (04) ◽  
Author(s):  
J. P. Lakher ◽  
M. K. Awasthi ◽  
J. R. Khan ◽  
M. R. Poyam
Keyword(s):  
Fixed Time ◽  
Conception Rate ◽  
Control Group ◽  
Group Iii ◽  
Treatment Groups ◽  
Group I ◽  
Early Postpartum ◽  
The Status ◽  
Sahiwal Cows ◽  
And Control

The present study was conducted to investigate the efficacy of Ovsynch and Ovsynch plus protocol in postpartum (day 60) Sahiwal cows (n=18). Animals were randomly divided into three equal groups, viz., Ovsynch group Ovsynch plus group and Control group. Animals of group I (n = 6) were treated with traditional Ovsynch protocol. The animals (n = 6) of group II were treated with Ovsynch plus protocol which consisted of an initial intramuscular injection of eCG (Folligon) @ 250 IU on day 60 postpartum followed 3 days later by GPG (Ovsynch) protocol. In group-III Control, no treatment was given to animals (n = 6). Treated animals were inseminated at a fixed time between 14 and 20 hrs after second GnRH injection, irrespective of estrus detection. Blood samples were collected from each animal on days 50 and 60 postpartum to determine the status of cyclicity in animals based on serum concentrations of progesterone (P4). A third blood sample was collected on the day of prostaglandin treatment to determine the response of first GnRH injection. Four animals each were cyclic, and two were acyclic in both treatment groups. Four animals each responded to first GnRH treatment in both treatment groups. Similarly, two animals each got conceived giving conception rate of 50% (2/4) in each treatment. In the control group, one out of 6 animals got conceived yielding 16.66 % conception rate (1/6) during the study period. It may be thus concluded that Ovsynch and Ovsynch plus protocol may be used during the early postpartum period to improve the reproductive efficiency in postpartum Sahiwal cows.

scholarly journals Real-Time In Vivo Bioluminescent Imaging for Evaluating the Efficacy of Antibiotics in a Rat Staphylococcus aureus Endocarditis Model

2005 ◽  
Vol 49 (1) ◽  
pp. 380-387 ◽  
Author(s):  
Yan Q. Xiong ◽  
Julie Willard ◽  
Jagath L. Kadurugamuwa ◽  
Jun Yu ◽  
Kevin P. Francis ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Real Time ◽  
Imaging System ◽  
Bioluminescent Imaging ◽  
Vancomycin Therapy ◽  
Treatment Groups ◽  
Highly Sensitive ◽  
Relevant Animal Model ◽  
And Control

ABSTRACT Therapeutic options for invasive Staphylococcus aureus infections have become limited due to rising antimicrobial resistance, making relevant animal model testing of new candidate agents more crucial than ever. In the present studies, a rat model of aortic infective endocarditis (IE) caused by a bioluminescently engineered, biofilm-positive S. aureus strain was used to evaluate real-time antibiotic efficacy directly. This strain was vancomycin and cefazolin susceptible but gentamicin resistant. Bioluminescence was detected and quantified daily in antibiotic-treated and control animals with IE, using a highly sensitive in vivo imaging system (IVIS). Persistent and increasing cardiac bioluminescent signals (BLS) were observed in untreated animals. Three days of vancomycin therapy caused significant reductions in both cardiac BLS (>10-fold versus control) and S. aureus densities in cardiac vegetations (P < 0.005 versus control). However, 3 days after discontinuation of vancomycin therapy, a greater than threefold increase in cardiac BLS was observed, indicating relapsing IE (which was confirmed by quantitative culture). Cefazolin resulted in modest decreases in cardiac BLS and bacterial densities. These microbiologic and cardiac BLS differences during therapy correlated with a longer time-above-MIC for vancomycin (>12 h) than for cefazolin (∼4 h). Gentamicin caused neither a reduction in cardiac S. aureus densities nor a reduction in BLS. There were significant correlations between cardiac BLS and S. aureus densities in vegetations in all treatment groups. These data suggest that bioluminescent imaging provides a substantial advance in the real-time monitoring of the efficacy of therapy of invasive S. aureus infections in live animals.

scholarly journals Bioimpedance Guided Fluid Management in Peritoneal Dialysis

2020 ◽  
Vol 15 (5) ◽  
pp. 685-694 ◽  
Author(s):  
Na Tian ◽  
Xiao Yang ◽  
Qunying Guo ◽  
Qian Zhou ◽  
Chunyan Yi ◽  
...  
Keyword(s):  
Peritoneal Dialysis ◽  
Patient Survival ◽  
Fluid Management ◽  
Volume Overload ◽  
Short Term ◽  
Cardiovascular Disease Mortality ◽  
Technique Survival ◽  
Disease Mortality ◽  
Clinical Methods ◽  
And Control

Background and objectivesBioelectrical impedance analysis (BIA) devices can help assess volume overload in patients receiving maintenance peritoneal dialysis. However, the effects of BIA on the short-term hard end points of peritoneal dialysis lack consistency. This study aimed to test whether BIA-guided fluid management could improve short-term outcomes in patients on peritoneal dialysis.Design, setting, participants, & measurementsA single-center, open-labeled, randomized, controlled trial was conducted. Patients on prevalent peritoneal dialysis with volume overload were recruited from July 1, 2013 to March 30, 2014 and followed for 1 year in the initial protocol. All participants with volume overload were 1:1 randomized to the BIA-guided arm (BIA and traditional clinical methods) and control arm (only traditional clinical methods). The primary end point was all-cause mortality and secondary end points were cardiovascular disease mortality and technique survival.ResultsA total of 240 patients (mean age, 49 years; men, 51%; diabetic, 21%, 120 per group) were enrolled. After 1-year follow-up, 11(5%) patients died (three in BIA versus eight in control) and 21 patients were permanently transferred to hemodialysis (eight in BIA versus 13 in control). The rate of extracellular water/total body water decline in the BIA group was significantly higher than that in the control group. The 1-year patient survival rates were 96% and 92% in BIA and control groups, respectively. No significant statistical differences were found between patients randomized to the BIA-guided or control arm in terms of patient survival, cardiovascular disease mortality, and technique survival (P>0.05).ConclusionsAlthough BIA-guided fluid management improved the fluid overload status better than the traditional clinical method, no significant effect was found on 1-year patient survival and technique survival in patients on peritoneal dialysis.

scholarly journals The use of a ‘first-wave’ model to study the effect of nutrition on ovarian follicular dynamics and ovulation rate in the sheep

Reproduction ◽  
2010 ◽  
Vol 140 (6) ◽  
pp. 865-874 ◽  
Author(s):  
C Viñoles ◽  
B Paganoni ◽  
K M M Glover ◽  
J T B Milton ◽  
D Blache ◽  
...  
Keyword(s):  
Body Condition ◽  
Wave Model ◽  
Ovulation Rate ◽  
Short Term ◽  
Metabolic Hormones ◽  
Follicular Waves ◽  
Follicular Wave ◽  
The Third ◽  
High Concentrations ◽  
Follicular Dynamics

We have developed an experimental model in which groups of ewes are simultaneously experiencing the first ovarian follicular wave of their oestrous cycle. We used this ‘first-wave model’ in a 2×2 factorial experiment (ten ewes per group) to study the effect of body condition (BC) and a short-term supplement on follicular dynamics and ovulation rate. The ‘first-wave’ was established by giving ewes three injections of prostaglandin (PG), 7 days apart. The 6-day supplement (lupin grain) began 2 days after the second PG injection and continued until the third. Follicles were studied by ultrasound, and blood was sampled to measure glucose and hormones. The supplement increased (P<0.01) the concentrations of glucose, insulin and leptin, decreased FSH concentrations (P<0.01) and tended to increase oestradiol concentrations (P=0.06). The supplement tended to increase the number of 3 mm follicles (P=0.06). Compared with low-BC ewes, high-BC ewes had more follicular waves (P<0.05), higher concentrations of insulin, leptin and IGF1 (P<0.05) and tended to have higher FSH concentrations (P=0.09). Leptin and insulin concentrations remained high until the end of supplementation in high-BC ewes, whereas they decreased after the third day of supplementation in low-BC ewes. In conclusion, high concentrations of metabolic hormones in fat ewes are associated with the development of more follicular waves. When a supplement is superimposed on this situation, changes in glucose and metabolic hormones allow more follicles to be selected to ovulate.

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