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Effect of Oxytocinonmilkcomposition of Sahiwal Cowat Different Lactation Stages

Thesis Info

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Author

Hameed, Aneela

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2010

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/929

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725985066

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The present study was planned to investigate the effect of oxytocin administration to Sahiwal cow, local breed of Pakistan on milk composition with respect to lactation stages (mature milk, peak production and end production). Sixteen cows were divided into two groups. One group was subjected to intramuscular injection of oxytocin (20IU) and other group kept as control. Milk samples were collected from both groups at different lactation stages and evaluated for various parameters. The pH, fat, protein, total solids and ash increased, lactose and acidity decreased, whereas solid not fat were not affected by the lactation stages. Oxytocin administration to cows resulted in decreased of milk fat, lactose, protein, total solids, solids not fat and increased in ash content. Phosphorous and sodium concentration increased while copper, zinc and potassium decreased with lactation stages. Magnesium, calcium and chloride content first decreased at peak production stage then increased at the late lactation stage. Administration of oxytocin also resulted in increased concentration of sodium, chloride and decreased in potassium content at all lactation stages whereas increase in copper content in oxytocin treated milk at end production was observed. The concentration of fatty acids (from C4:0 to C14:0) increased upto peak production and then decreased at the end of lactation stages. The palmatic acid (C16:0) increased while stearic acid (C18:0) and oleic acid (C18:1) decreased with the progress of lactation stages. There was no effect of oxytocin on the C4:0, C8:0, C10:0, C14:0 and C18:0 fatty acids while C6:0, C12:0, C16:0 and C18:1 fatty acid decreased on oxytocin administration. Electrophoretic study indicated maximum intensity of casein in milk at mid lactation stage, whereas whey content was found to be the highest at end production stage of milking. Casein (as1, as2 and β-CN) fractions and whey protein fractions (Ig, BSA, β-Lg and α-La) showed lighter bands in oxytocin injected milk as compared to control. Lactoperoxidase and acid phosphatase decreased while lipase activity increased with the progress of lactation. Alkaline phosphatase activity first increased then decreased at the end of lactation. Thiocyanate content also increased with lactation. Acid phosphatase increased and alkaline phosphatase and lipase decreased while there was no effect on the lactoperoxidase activity when the oxytocin was injected for a longer period. Thiocyanate content increased with the administration of oxytocin.
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اخلاقی اور روادار معاشرے کے قیام میں صوفیاء کا کردار

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Molecular Characterization of Resistant and Susceptible Sugarcane Saccharum Hybrids L. Cultivars to Smut Disease

Sugarcane (Saccharum hybrids L.) is a highly treasured perennial crop and happens to be the economic backbone of many countries including Pakistan. Apart from abiotic factors, diseases inflicted by fungal, bacterial or viral pathogens have the most damaging effect over the growth of sugarcane. Whip smut of sugarcane is one such disease caused by fungus Sporisorium scitamineum which posses a major threat to cane yield. The most effectual remedy to tackle the problem is to develop resistant cultivars that stand a far greater chance of surviving the disease outbreak.The advent of molecular marker techniques has massively enhanced the process of selection for disease resistance in sugarcane employed in breeding programs. The current work was a small contribution towards the same goal and exploited the potential of molecular markers to distinguish between smut resistant and susceptible cultivars of sugarcane. Moreover, identification of Resistance Gene Analogues (RGAs) was another strategy to understand the defense mechanism utilized by the crop. The initial screening experiments to differentiate between two completely resistant and two completely susceptible Pakistani cultivars involved detection of DNA polymorphism among the respective samples using 200 RAPD primers. Forty four of these primers turned out to be highly polymorphic, 20 of which produced trait specific loci in the four sugarcane genotypes. Furthermore, it was discovered that decamers A-20, E-05 and OPAV-10 produced 4 loci linked with resistant cultivars, while 4 loci were generated by primers B-17, OPAD-01, OPAD-13 and OPAX-14 specific to susceptible cultivars. However, primer A-09 amplified 2 markers of 1200 bp and 500 bp from resistant and susceptible cultivars, respectively. The disparity between resistant and susceptible cultivars was further highlighted when cluster analysis separated the two genotypes into two discrete groups. In order to detect RAPD markers associated with smut resistance phenotype in sugarcane, six pooled bulks of DNA from Pakistani cultivars (i.e. comprising 2 completely resistant, 2 completely susceptible, 4 moderately resistant and 4 moderately susceptible genotypes) and USA cultivar (i.e. containing 5 resistant and 5 susceptible clones of LCP85-84 F2 mapping population) were prepared. The screening of the six DNA bulks with 500 arbitrary decamers eventually revealed two RAPD markers (B-17 and I-20) linked with smut responses in Pakistani and USA cultivars, respectively. The marker B-17 produced a reproducible polymorphic fragment which appeared to cosegregate in repulsion with sugarcane smut resistance in Pakistani cultivars. On the other hand, RAPD decamer I-20 was tightly linked with resistance in smut resistant clones of USA cultivar LCP85-384 F2 population. Two Sequence Characterized Amplified Region (SCAR) markers were designed from the sequences of B-17 and I-20 products and were found to be specific to resistant cultivars of Pakistan and resistant clones of LCP85-384 F2 population, respectively. The SCAR marker developed from B-17 sequence was used to screen seven additional sugarcane cultivars of Pakistan with SCAR marker, verified the earlier findings by showing essentially similar results.In order to conduct further study, ten sets of oligonucleotides were designed to tag the nucleotide-binding site attached to leucine-rich repeat (NBS-LRR) domain of RGAs (resistance gene analogues) and other related sequences reported in the members of family Poaceae (maize, rice, sorghum and foxtail millet). The PCR amplifications of Pakistani and USA cultivars using these 10 primers resulted in the identification of three RGAs (MRGA3, MRGA5 and MRGA2) showing discriminating products with respect to smut resistance trait in sugarcane. The sequences of three isolated RGAs were analyzed and compared with that of documented R genes. The results of NCBI blast, multiple sequence alignment and phylogenetic analysis showed sequence homology of the three RGAs with reported R genes and RGA-like sequences. The final study was based on targeting sequences in sugarcane genome which may have a part to play in the resistance mechanism of plants against fungal attack. These sequences included a reported SCAR marker linked with covered smut resistance in barley and a canecystatin partial mRNA sequence. In a nut-shell, our study provided molecular basis to distinguish between smut resistant and smut susceptible sugarcane cultivars of both Pakistan and USA.